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HTML 

              
                
<div id="app">
  <div class="blanket" v-if="!loaded"></div>
  <button class="mail-open" v-on:click="openInbox" v-if="!messages.length"><div class="icon icon--mail">
<svg width="100%" viewBox="0 0 24 24">
  <path d="M20,8L12,13L4,8V6L12,11L20,6M20,4H4C2.89,4 2,4.89 2,6V18A2,2 0 0,0 4,20H20A2,2 0 0,0 22,18V6C22,4.89 21.1,4 20,4Z" />
</svg>
</div>
  </button>
  <div class="mail-inbox" v-if="messages.length">
    <header class="mail-screen-header">
      <button class="mail-close" v-on:click="closeInbox"><svg class='icon icon--back' preserveAspectRatio="xMinYMin" height="24" width="24" viewBox="0 0 24 24">
    <path d="M20,11V13H8L13.5,18.5L12.08,19.92L4.16,12L12.08,4.08L13.5,5.5L8,11H20Z"></path>
</svg>
      </button>
      <h1 class="mail-header__title">Inbox</h1>
      <button class="mail-message__action" v-on:click="openSettings"><svg preserveAspectRatio="xMinYMin" class="icon icon--gear" height="24" width="24" viewBox="0 0 24 24">
    <path d="M12,15.5A3.5,3.5 0 0,1 8.5,12A3.5,3.5 0 0,1 12,8.5A3.5,3.5 0 0,1 15.5,12A3.5,3.5 0 0,1 12,15.5M19.43,12.97C19.47,12.65 19.5,12.33 19.5,12C19.5,11.67 19.47,11.34 19.43,11L21.54,9.37C21.73,9.22 21.78,8.95 21.66,8.73L19.66,5.27C19.54,5.05 19.27,4.96 19.05,5.05L16.56,6.05C16.04,5.66 15.5,5.32 14.87,5.07L14.5,2.42C14.46,2.18 14.25,2 14,2H10C9.75,2 9.54,2.18 9.5,2.42L9.13,5.07C8.5,5.32 7.96,5.66 7.44,6.05L4.95,5.05C4.73,4.96 4.46,5.05 4.34,5.27L2.34,8.73C2.21,8.95 2.27,9.22 2.46,9.37L4.57,11C4.53,11.34 4.5,11.67 4.5,12C4.5,12.33 4.53,12.65 4.57,12.97L2.46,14.63C2.27,14.78 2.21,15.05 2.34,15.27L4.34,18.73C4.46,18.95 4.73,19.03 4.95,18.95L7.44,17.94C7.96,18.34 8.5,18.68 9.13,18.93L9.5,21.58C9.54,21.82 9.75,22 10,22H14C14.25,22 14.46,21.82 14.5,21.58L14.87,18.93C15.5,18.67 16.04,18.34 16.56,17.94L19.05,18.95C19.27,19.03 19.54,18.95 19.66,18.73L21.66,15.27C21.78,15.05 21.73,14.78 21.54,14.63L19.43,12.97Z" />
</svg>
      </button>
    </header>
    <div class="mail-settings" v-if="openingSettings || settingsOpen">
      <header class="mail-screen-header">
        <button class="mail-close" v-on:click="closeSettings"><svg preserveAspectRation="xMinYMin" class="icon icon--close" height="24" width="24" viewBox="0 0 24 24">
    <path d="M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z" />
</svg>
        </button>
        <h1 class="mail-header__title">Settings</h1>
      </header>
      <div class="mail-screen-content">
        <div class="mail-settings__setting">
          <input type="color" id="theme" :value="theme" v-on:change="updateTheme"/>
          <label for="theme">Theme</label>
        </div>
      </div>
    </div>
    <div class="mail-container" ref="mailContainer" v-if="activeMessage" v-bind:class="{'mail-message--opening': activeMessage &amp;&amp; !messageOpen, 'mail-message--open': messageOpen}">
      <header class="mail-screen-header mail-screen-header--fake" ref="fakeHeader">
        <button class="mail-close" v-on:click="closeInbox"><svg class='icon icon--back' preserveAspectRatio="xMinYMin" height="24" width="24" viewBox="0 0 24 24">
    <path d="M20,11V13H8L13.5,18.5L12.08,19.92L4.16,12L12.08,4.08L13.5,5.5L8,11H20Z"></path>
</svg>
        </button>
        <h1 class="mail-header__title">Inbox</h1>
        <button class="mail-message__action" v-on:click="openSettings"><svg preserveAspectRatio="xMinYMin" class="icon icon--gear" height="24" width="24" viewBox="0 0 24 24">
    <path d="M12,15.5A3.5,3.5 0 0,1 8.5,12A3.5,3.5 0 0,1 12,8.5A3.5,3.5 0 0,1 15.5,12A3.5,3.5 0 0,1 12,15.5M19.43,12.97C19.47,12.65 19.5,12.33 19.5,12C19.5,11.67 19.47,11.34 19.43,11L21.54,9.37C21.73,9.22 21.78,8.95 21.66,8.73L19.66,5.27C19.54,5.05 19.27,4.96 19.05,5.05L16.56,6.05C16.04,5.66 15.5,5.32 14.87,5.07L14.5,2.42C14.46,2.18 14.25,2 14,2H10C9.75,2 9.54,2.18 9.5,2.42L9.13,5.07C8.5,5.32 7.96,5.66 7.44,6.05L4.95,5.05C4.73,4.96 4.46,5.05 4.34,5.27L2.34,8.73C2.21,8.95 2.27,9.22 2.46,9.37L4.57,11C4.53,11.34 4.5,11.67 4.5,12C4.5,12.33 4.53,12.65 4.57,12.97L2.46,14.63C2.27,14.78 2.21,15.05 2.34,15.27L4.34,18.73C4.46,18.95 4.73,19.03 4.95,18.95L7.44,17.94C7.96,18.34 8.5,18.68 9.13,18.93L9.5,21.58C9.54,21.82 9.75,22 10,22H14C14.25,22 14.46,21.82 14.5,21.58L14.87,18.93C15.5,18.67 16.04,18.34 16.56,17.94L19.05,18.95C19.27,19.03 19.54,18.95 19.66,18.73L21.66,15.27C21.78,15.05 21.73,14.78 21.54,14.63L19.43,12.97Z" />
</svg>
        </button>
      </header>
      <ul class="fake-messages fake-messages--top" ref="fakeTop" v-if="activeMessage &amp;&amp; !messageOpen" v-bind:style="{bottom: fakeOnePos}">
        <li class="mail-message" v-for="(message, idx) in messages.slice(activeMessageIndex - 8 &gt; 0 ? activeMessageIndex - 8 : 0, activeMessageIndex)">
          <button class="mail-message"><img class="mail-message__avatar" :src="message.from.avatar"/>
            <div class="mail-message__info">
              <div class="mail-message__sender">{{message.from.name}}</div>
              <div class="mail-message__subject">{{message.subject}}</div>
              <div class="mail-message__timestamp">{{message.received}}</div>
            </div>
          </button>
        </li>
      </ul>
      <ul class="fake-messages fake-messages--bottom" ref="fakeBottom" v-if="activeMessage &amp;&amp; !messageOpen" v-bind:style="{top: fakeTwoPos}">
        <li class="mail-message" v-for="(message, idx) in messages.slice(activeMessageIndex + 1, activeMessageIndex + 9 &lt; messages.length ? activeMessageIndex + 9 : messages.length)">
          <button class="mail-message"><img class="mail-message__avatar" :src="message.from.avatar"/>
            <div class="mail-message__info">
              <div class="mail-message__sender">{{message.from.name}}</div>
              <div class="mail-message__subject">{{message.subject}}</div>
              <div class="mail-message__timestamp">{{message.received}}</div>
            </div>
          </button>
        </li>
      </ul>
      <header class="mail-screen-header mail-container__header">
        <button class="mail-message__action" v-on:click="closeMessage"><svg class='icon icon--back' preserveAspectRatio="xMinYMin" height="24" width="24" viewBox="0 0 24 24">
    <path d="M20,11V13H8L13.5,18.5L12.08,19.92L4.16,12L12.08,4.08L13.5,5.5L8,11H20Z"></path>
</svg>
        </button>
        <button class="mail-message__action"><svg preserveAspectRatio="xMinYMin" class='icon icon--reply' height="24" width="24"  viewBox="0 0 24 24">
  <path d="M9,22A1,1 0 0,1 8,21V18H4A2,2 0 0,1 2,16V4C2,2.89 2.9,2 4,2H20A2,2 0 0,1 22,4V16A2,2 0 0,1 20,18H13.9L10.2,21.71C10,21.9 9.75,22 9.5,22V22H9Z"></path>
</svg>
        </button>
        <button class="mail-message__action"><svg preserveAspectRatio="xMinYMin" class='icon icon--star' height="24" width="24"  viewBox="0 0 24 24">
  <path d="M12,17.27L18.18,21L16.54,13.97L22,9.24L14.81,8.62L12,2L9.19,8.62L2,9.24L7.45,13.97L5.82,21L12,17.27Z"></path>
</svg>
        </button>
        <button class="mail-message__action"><svg preserveAspectRatio="xMinYMin" class="icon icon--trash" height="24" width="24"  viewBox="0 0 24 24">
    <path d="M19,4H15.5L14.5,3H9.5L8.5,4H5V6H19M6,19A2,2 0 0,0 8,21H16A2,2 0 0,0 18,19V7H6V19Z" />
</svg>
        </button>
        <button class="mail-message__action"><svg preserveAspectRatio="xMinYMin" class='icon icon--warning' height="24" width="24"  viewBox="0 0 24 24">
  <path d="M13,14H11V10H13M13,18H11V16H13M1,21H23L12,2L1,21Z"></path>
</svg>
        </button>
      </header>
      <div class="mail-message__header mail-container__message-header" ref="mailHeader" v-bind:style="{top: messageTop + 'px'}"><img class="mail-message__avatar" ref="mailAvatar" :src="activeMessage.from.avatar"/>
        <div class="mail-message__info">
          <div class="mail-message__sender" ref="mailSender">{{activeMessage.from.name}}</div>
          <div class="mail-message__subject" ref="mailSubject">{{activeMessage.subject}}</div>
          <div class="mail-message__timestamp" ref="mailTimestamp">{{activeMessage.received}}</div>
        </div>
      </div>
      <article class="mail-message__message" ref="mailContent">{{activeMessage.message}}</article>
    </div>
    <ul class="mail-messages mail-messages--main" v-bind:class="{'mail-messages--load': !mailOpened}">
      <li v-for="(message, idx) in messages">
        <button class="mail-message" :id="'message--' + idx" v-on:click="openMessage(message, idx)"><img class="mail-message__avatar" :src="message.from.avatar"/>
          <div class="mail-message__info">
            <div class="mail-message__sender">{{message.from.name}}</div>
            <div class="mail-message__subject">{{message.subject}}</div>
            <div class="mail-message__timestamp">{{message.received}}</div>
          </div>
        </button>
      </li>
    </ul>
    <button class="mail-compose-button" v-on:click="openComposer" v-if="!composerOpen"><svg class='icon icon--compose' preserveAspectRatio="xMinYMin" height="24" width="24" viewBox="0 0 24 24">
  <path d="M20.71,4.04C21.1,3.65 21.1,3 20.71,2.63L18.37,0.29C18,-0.1 17.35,-0.1 16.96,0.29L15,2.25L18.75,6M17.75,7L14,3.25L4,13.25V17H7.75L17.75,7Z"></path>
</svg>
    </button>
    <div class="mail-composer" v-if="openingComposer || composerOpen">
      <header class="mail-screen-header">
        <button class="mail-message__action" v-on:click="closeComposer"><svg preserveAspectRation="xMinYMin" class="icon icon--close" height="24" width="24" viewBox="0 0 24 24">
    <path d="M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z" />
</svg>
        </button>
        <h1 class="mail-header__title mail-composer__title">Compose</h1>
        <button class="mail-message__action"><svg preserveAspectRatio="xMinYMin" class='icon icon--paperclip' height="24" width="24"  viewBox="0 0 24 24">
    <path d="M7.5,18A5.5,5.5 0 0,1 2,12.5A5.5,5.5 0 0,1 7.5,7H18A4,4 0 0,1 22,11A4,4 0 0,1 18,15H9.5A2.5,2.5 0 0,1 7,12.5A2.5,2.5 0 0,1 9.5,10H17V11.5H9.5A1,1 0 0,0 8.5,12.5A1,1 0 0,0 9.5,13.5H18A2.5,2.5 0 0,0 20.5,11A2.5,2.5 0 0,0 18,8.5H7.5A4,4 0 0,0 3.5,12.5A4,4 0 0,0 7.5,16.5H17V18H7.5Z" />
</svg>
        </button>
        <button class="mail-message__action"><svg preserveAspectRatio="xMinYMin" class='icon icon--send' height="24" width="24"  viewBox="0 0 24 24">
    <path d="M2,21L23,12L2,3V10L17,12L2,14V21Z" />
</svg>
        </button>
      </header>
      <form class="mail-screen-content">
        <input type="text" placeholder="To"/>
        <input type="text" placeholder="Subject"/>
        <textarea type="text" placeholder="Compose"></textarea>
      </form>
    </div>
  </div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Lato:300,400')

$bg = #6c7a89
$appWhite = #ecf0f1
$appAccent = #a7dde9
$textColor = #707070
$borderColor = lighten(#b5c5c9, 50%)
$textColorSecondary = #7e7e7e
$animDuration = .15s

:root
  --accent $appAccent

*
  box-sizing border-box
  outline 0

html
body
  align-items      center
  background       linear-gradient(45deg, #f39c12, #913d88)
  color $textColor
  display          flex
  flex-direction    column
  font-size        16px
  font-family 'Lato', sans-serif
  justify-content  center
  margin           0
  overflow          auto
  padding          0
  width            100vw
  min-height       100vh

label
  color $textColor

input
label
  cursor pointer

input[type="color"]
  height 40px
  width 40px
  border 0
  margin-right 10px

form
  width 100%
  padding 0 10px 10px
  display flex
  flex-direction column
  margin 0

  input
  textarea
    border-radius 4px
    border 0
    margin-bottom 4px
    padding 4px 12px
    font-family 'Lato', sans-serif
    width 100%
    line-height 30px

    &::placeholder
      color #c3c3c3

  textarea
    flex 1
    resize none

button
  background-color var(--accent)
  cursor pointer
  border 0
  display flex
  justify-content center
  align-items center

.blanket
  background-color $appAccent
  z-index 10
  position absolute
  top 0
  right 0
  bottom 0
  left 0

  &:after
    box-sizing border-box
    content ''
    height 50px
    width 50px
    border 5px solid white
    border-radius 100%
    border-left-color transparent
    border-right-color transparent
    position absolute
    top 50%
    left 50%
    margin-left -25px
    margin-top -25px
    animation rotate .5s infinite linear


.mail-screen-content
  // padding 10px
  padding-left 10px
  width 100%
  height 100%
  overflow auto
  position relative

.icon
  fill $appWhite
  position absolute
  height 24px
  width 24px

  &:hover
    fill darken($appWhite, 2%)


#app
  height 100vh
  width 100vw
  position relative
  background-color var(--accent)
  overflow hidden

  @media(min-width 768px)
    height 480px
    width 320px

.mail-inbox
  height 100%
  background-color $appWhite

.mail-settings
  height 100%
  width 100%
  background-color $appWhite
  position absolute
  top 0
  left 0
  z-index 3

  &__setting
    display flex
    flex-direction row
    align-items center

.mail-close
  position absolute
  left 0
  height 50px
  width 50px

.mail-header__title
  margin 0
  padding 0
  line-height 50px
  font-size 1.2rem
  color $appWhite
  flex 1
  text-align left
  padding-left 54px

.mail-messages
.fake-messages
  background $appWhite
  padding 0
  margin 0
  list-style none
  overflow auto
  position absolute
  top 50px
  left 0
  right 0
  bottom 0
  padding-bottom 50px

.fake-messages
  bottom auto
  z-index 2
  top auto
  padding 0


/**
  * Mail messages should animate on first load
*/
.mail-messages--load
  .mail-message
    opacity 0
    animation fadeIn $animDuration ease 0s
    animation-fill-mode forwards

  for $message in (1..15)
    li:nth-child({$message})
      button
        animation-delay ($message * .1s)


.mail-screen-header
  background-color var(--accent)
  position relative
  height 50px
  display flex
  align-items center
  justify-content flex-end
  overflow hidden
  width 100%

  button:first-child
    position absolute
    left 0

  &--fake
    z-index 3

/**
  * Message styling
*/
.mail-message--focus .mail-message__info
  height 60px
  padding-right 0

  .mail-message__subject
    white-space pre-wrap

.mail-container
  background $appWhite
  position absolute
  top 0
  right 0
  bottom 0
  left 0

  &__header
    position absolute
    top 0

  &__message-header
    padding 10px 0 10px 10px
    top 0

    .mail-message__avatar
      height 50px
      width 50px
    .mail-message__subject
      overflow visible
      white-space initial
      overflow initial
      font-weight bolder
      font-size 1.25rem
    .mail-message__sender
      font-size 0.75rem
    .mail-message__timestamp
      transform translateY(-20px)

button.mail-message
  padding 0
  padding-left 10px

  &:hover
    background-color darken($appWhite, 2%)

.mail-message
  background-color $appWhite
  height 60px
  width 100%

  &__action
    height 50px
    width 50px

  &--opening
  &--open
    position absolute
    z-index 3
    border 0


  &__header
    display flex
    flex-direction row
    align-items center
    min-height 60px
    position absolute
    width 100%
    padding-left 10px
    background $appWhite
    top 50px

  &__content
    overflow auto

  &__message
    color $textColorSecondary
    font-weight 300
    padding 0 10px 50px 10px
    opacity 0
    overflow auto
    position absolute
    top 100%

  &__avatar
    height 34px
    width  34px
    background-color var(--accent)
    border-radius 100%
    overflow hidden

  &__info
    display flex
    flex-direction column
    align-items flex-start
    flex 1
    padding-left 10px
    min-height 60px
    justify-content center
    padding-right 60px
    position relative
    overflow hidden

  &__timestamp
    height 50px
    width 50px
    position absolute
    right 10px
    top 5px
    font-size 0.75rem
    display flex
    align-items center
    justify-content center
    color $textColor

  &__sender
    font-size 1rem
    font-weight 400
    color $textColor

  &__subject
    font-size .75rem
    font-weight 300
    color $textColorSecondary
    white-space nowrap
    text-overflow ellipsis
    overflow hidden
    width 100%
    text-align left



.mail-compose-button
  height 44px
  width 44px
  background-color var(--accent)
  border-radius 100%
  border 0
  cursor pointer
  bottom 10px
  right 10px
  position absolute
  z-index 2
  box-shadow 0 2px 2px #c3c3c3


.mail-composer
  height 44px
  width 44px
  border-radius 100%
  border none
  position absolute
  bottom 10px
  right 10px
  transform-origin bottom right
  background-color var(--accent)
  display flex
  flex-direction column
  z-index 4

.mail-open
  height 50px
  width 50px
  position absolute
  top 50%
  left 50%
  margin-left -25px
  margin-top -25px
  border-radius 100%
  border 5px solid $appWhite
  animation pulse 4s infinite ease
  background-color var(--accent)

  .icon:hover
    fill $appWhite


@keyframes pulse
  0%, 100%
    transform scale(1)
    box-shadow 0px 2px 2px black
  50%
    transform scale(1.05)
    box-shadow 0px 4px 4px black

@keyframes fadeIn
  from
    opacity 0
  to
    opacity 1

@keyframes rotate
  to
    transform rotate(360deg)
!

JS 

              
                const ANIMATION_DURATION = 0.25
const CLASSES = {
  COMPOSER: 'mail-composer',
  HEADER: 'mail-screen-header',
  SETTINGS: 'mail-settings',
}
let messages = []
for (let i = 0; i < 15; i++) {
  messages.push({
    from: {
      avatar: faker.image.avatar(),
      name: faker.name.findName(),
    },
    received: moment(faker.date.recent()),
    subject: faker.company.bs(),
    message: faker.lorem.paragraphs(Math.floor(Math.random() * 10 + 2)),
  })
}
messages = messages.sort((a, b) => a.received.diff(b.received)).reverse()

for (let message of messages) {
  if (message.received.isAfter(moment().subtract(5, 'hours'))) {
    message.received = message.received.format('HH:mm')
  } else {
    message.received = message.received.format('D MMM')
  }
}

const app = new Vue({
  el: '#app',
  data: {
    theme: '#a7dde9',
    openingComposer: false,
    closingComposer: false,
    composerOpen: false,
    messageOpen: false,
    activeMessage: undefined,
    activeMessageIndex: undefined,
    fakeOnePos: undefined,
    fakeTwoPos: undefined,
    messageTop: undefined,
    mailOpened: false,
    openingSettings: false,
    closingSettings: false,
    settingsOpen: false,
    loaded: false,
    messages: [],
  },
  mounted: function() {
    this.loaded = true
  },
  methods: {
    openComposer: function() {
      this.openingComposer = !this.openingComposer
      this.$nextTick(() => {
        const composer = document.querySelector(`.${CLASSES.COMPOSER}`)
        const composerTl = new TimelineMax({
          onComplete: () => {
            this.openingComposer = false
            this.composerOpen = true
            this.mailOpened = true
          },
        })
        composerTl.add(
          TweenMax.to(composer, ANIMATION_DURATION, {
            right: 0,
            bottom: 0,
            height: '100%',
            width: '100%',
            borderRadius: 0,
          })
        )
      })
    },
    closeComposer: function() {
      this.closingComposer = !this.closingComposer
      const composer = document.querySelector(`.${CLASSES.COMPOSER}`)
      const composerTl = new TimelineMax({
        onComplete: () => {
          this.composerOpen = false
          this.closingComposer = false
        },
      })
      composerTl.add(
        TweenMax.to(composer, ANIMATION_DURATION, {
          bottom: 10,
          right: 10,
          height: 44,
          width: 44,
          borderRadius: '100%',
        })
      )
    },
    openInbox: function() {
      this.messages = messages
    },
    closeInbox: function() {
      this.messages = []
      this.mailOpened = false
    },
    closeMessage: function() {
      TweenMax.to(this.$refs.mailContainer, ANIMATION_DURATION, {
        onComplete: () => {
          this.activeMessage = null
          this.activeMessageIndex = null
          this.messageOpen = false
        },
        x: '-100%',
      })
    },
    openMessage: function(message, idx) {
      const el = document.getElementById(`message--${idx}`)
      const list = document.querySelector('.mail-messages--main')
      const header = document.querySelector(`.${CLASSES.HEADER}`)
      this.mailOpened = true
      this.activeMessage = message
      this.activeMessageIndex = idx
      this.fakeTwoPos =
        el.offsetTop + el.offsetHeight + header.offsetHeight - list.scrollTop
      this.messageTop = el.offsetTop + header.offsetHeight - list.scrollTop
      this.fakeOnePos = list.offsetHeight - el.offsetTop + list.scrollTop
      this.$nextTick(() => {
        const el = document.querySelector('.mail-message--opening')
        const {
          fakeTop,
          fakeBottom,
          fakeHeader,
          mailHeader,
          mailAvatar,
          mailSubject,
          mailSender,
          mailTimestamp,
          mailContainer,
          mailContent,
        } = this.$refs
        const fakeHeaderPos = fakeHeader.getBoundingClientRect()
        const mailHeaderPos = mailHeader.getBoundingClientRect()
        const mailContainerPos = mailContainer.getBoundingClientRect()
        const openTl = new TimelineMax({
          onComplete: () => {
            this.messageOpen = true
          },
        })
        openTl
          // Move fakes out of the way
          .to(fakeHeader, ANIMATION_DURATION, { y: `-${this.messageTop}px` }, 0)
          .to(fakeTop, ANIMATION_DURATION, { bottom: '100%' }, 0)
          .to(fakeBottom, ANIMATION_DURATION, { top: '100%' }, 0)
          // Move header to top and change sizing
          .to(
            mailHeader,
            ANIMATION_DURATION,
            { y: `-${this.messageTop - fakeHeaderPos.height}`, paddingTop: 10 },
            0
          )
          .from(
            mailAvatar,
            ANIMATION_DURATION,
            { height: '34px', width: '34px' },
            0
          )
          .from(
            mailTimestamp,
            ANIMATION_DURATION,
            { fontSize: '0.75rem', y: 0 },
            0
          )
          .from(
            mailSubject,
            ANIMATION_DURATION,
            {
              overflow: 'hidden',
              fontSize: '0.75rem',
              fontWeight: '400',
              color: '#7e7e7e',
            },
            0
          )
          .from(mailSender, ANIMATION_DURATION, { fontSize: '1rem' }, 0)
          // Animate in the article
          .to(
            mailContent,
            ANIMATION_DURATION,
            {
              height: `${mailContainerPos.height -
                (mailHeaderPos.height + fakeHeaderPos.height)}px`,
              opacity: 1,
              y: `-${mailContainerPos.height -
                (mailHeaderPos.height + fakeHeaderPos.height)}px`,
            },
            0
          )
      })
    },
    openSettings: function() {
      this.openingSettings = !this.openingSettings
      this.$nextTick(() => {
        const el = document.querySelector(`.${CLASSES.SETTINGS}`)
        TweenMax.from(el, ANIMATION_DURATION, {
          onComplete: () => {
            this.openingSettings = false
            this.settingsOpen = true
          },
          x: '100%',
        })
      })
    },
    closeSettings: function() {
      const el = document.querySelector(`.${CLASSES.SETTINGS}`)
      TweenMax.to(el, ANIMATION_DURATION, {
        onComplete: () => {
          this.openeingSettings = false
          this.settingsOpen = false
        },
        x: '100%',
      })
    },
    updateTheme: function(e) {
      this.theme = e.target.value
      document.documentElement.style.setProperty('--accent', e.target.value)
    },
  },
})
!
999px

Console