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     <div class="msg-username">Madison Jones</div>
     <div class="msg-content">
      <span class="msg-message">What time was our meet</span>
      <span class="msg-date">20m</span>
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     <div class="msg-username">Miguel Cohen</div>
     <div class="msg-content">
      <span class="msg-message">Adaptogen taiyaki austin jean shorts brunch</span>
      <span class="msg-date">20m</span>
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      <span class="msg-message">Aysenur: I love CSS</span>
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     <div class="msg-username">Lea Debere</div>
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      <span class="msg-message">Shoreditch iPhone jianbing</span>
      <span class="msg-date">45m</span>
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   <div class="msg online">
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     <div class="msg-username">Jordan Smith</div>
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      <span class="msg-message">Snackwave craft beer raclette, beard kombucha </span>
      <span class="msg-date">2h</span>
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     <div class="msg-username">Jared Jackson</div>
     <div class="msg-content">
      <span class="msg-message">Tattooed brooklyn typewriter gastropub</span>
      <span class="msg-date">18m</span>
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   <div class="msg online">
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     <div class="msg-username">Henry Clark</div>
     <div class="msg-content">
      <span class="msg-message">Ethical typewriter williamsburg lo-fi street art</span>
      <span class="msg-date">2h</span>
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     <div class="msg-username">Jason Mraz</div>
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      <span class="msg-message">I'm lucky I'm in love with my best friend</span>
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     <div class="msg-username">Chiwa Lauren</div>
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      <span class="msg-message">Pabst af 3 wolf moon</span>
      <span class="msg-date">28m</span>
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     <div class="msg-username">Caroline Orange</div>
     <div class="msg-content">
      <span class="msg-message">Bespoke aesthetic lyft woke cornhole</span>
      <span class="msg-date">35m</span>
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     <div class="msg-username">Lina Ashma</div>
     <div class="msg-content">
      <span class="msg-message">Migas food truck crucifix vexi</span>
      <span class="msg-date">42m</span>
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     <img src="https://images.unsplash.com/photo-1481349518771-20055b2a7b24?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2309&q=80" />

     <img src="https://images.unsplash.com/photo-1473170611423-22489201d919?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2251&q=80" />
     <img src="https://images.unsplash.com/photo-1579613832111-ac7dfcc7723f?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80" />
     <img src="https://images.unsplash.com/photo-1523275335684-37898b6baf30?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2189&q=80" />
    </div>
    <div class="view-more">View More</div>
   </div>
   <a href="https://twitter.com/AysnrTrkk" class="follow-me" target="_blank">
    <span class="follow-text">
     <svg viewBox="0 0 24 24" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round" class="css-i6dzq1">
      <path d="M23 3a10.9 10.9 0 0 1-3.14 1.53 4.48 4.48 0 0 0-7.86 3v1A10.66 10.66 0 0 1 3 4s-4 9 5 13a11.64 11.64 0 0 1-7 2c9 5 20 0 20-11.5a4.5 4.5 0 0 0-.08-.83A7.72 7.72 0 0 0 23 3z"></path>
     </svg>
     Follow me on Twitter
    </span>
    <span class="developer">
     <img src="https://pbs.twimg.com/profile_images/1253782473953157124/x56UURmt_400x400.jpg" />
     Aysenur Turk — @AysnrTrkk
    </span>
   </a>
  </div>
 </div>
</div>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Manrope:300,400,500,600,700&display=swap&subset=latin-ext");

:root {
 --body-bg-color: #e5ecef;
 --theme-bg-color: #fff;
 --settings-icon-hover: #9fa7ac;
 --developer-color: #f9fafb;
 --input-bg: #f8f8fa;
 --input-chat-color: #a2a2a2;
 --border-color: #eef2f4;
 --body-font: "Manrope", sans-serif;
 --body-color: #273346;
 --settings-icon-color: #c1c7cd;
 --msg-message: #969eaa;
 --chat-text-bg: #f1f2f6;
 --theme-color: #0086ff;
 --msg-date: #c0c7d2;
 --button-bg-color: #f0f7ff;
 --button-color: var(--theme-color);
 --detail-font-color: #919ca2;
 --msg-hover-bg: rgba(238, 242, 244, 0.4);
 --active-conversation-bg: linear-gradient(
  to right,
  rgba(238, 242, 244, 0.4) 0%,
  rgba(238, 242, 244, 0) 100%
 );
 --overlay-bg: linear-gradient(
  to bottom,
  rgba(255, 255, 255, 0) 0%,
  rgba(255, 255, 255, 1) 65%,
  rgba(255, 255, 255, 1) 100%
 );
 --chat-header-bg: linear-gradient(
  to bottom,
  rgba(255, 255, 255, 1) 0%,
  rgba(255, 255, 255, 1) 78%,
  rgba(255, 255, 255, 0) 100%
 );
}

[data-theme="purple"] {
 --theme-color: #9f7aea;
 --button-color: #9f7aea;
 --button-bg-color: rgba(159, 122, 234, 0.12);
}

[data-theme="green"] {
 --theme-color: #38b2ac;
 --button-color: #38b2ac;
 --button-bg-color: rgba(56, 178, 171, 0.15);
}

[data-theme="orange"] {
 --theme-color: #ed8936;
 --button-color: #ed8936;
 --button-bg-color: rgba(237, 137, 54, 0.12);
}

.dark-mode {
 --body-bg-color: #1d1d1d;
 --theme-bg-color: #27292d;
 --border-color: #323336;
 --body-color: #d1d1d2;
 --active-conversation-bg: linear-gradient(
  to right,
  rgba(47, 50, 56, 0.54),
  rgba(238, 242, 244, 0) 100%
 );
 --msg-hover-bg: rgba(47, 50, 56, 0.54);
 --chat-text-bg: #383b40;
 --chat-text-color: #b5b7ba;
 --msg-date: #626466;
 --msg-message: var(--msg-date);
 --overlay-bg: linear-gradient(
  to bottom,
  rgba(0, 0, 0, 0) 0%,
  #27292d 65%,
  #27292d 100%
 );
 --input-bg: #2f3236;
 --chat-header-bg: linear-gradient(
  to bottom,
  #27292d 0%,
  #27292d 78%,
  rgba(255, 255, 255, 0) 100%
 );
 --settings-icon-color: #7c7e80;
 --developer-color: var(--border-color);
 --button-bg-color: #393b40;
 --button-color: var(--body-color);
 --input-chat-color: #6f7073;
 --detail-font-color: var(--input-chat-color);
}

.blue {
 background-color: #0086ff;
}

.purple {
 background-color: #9f7aea;
}

.green {
 background-color: #38b2ac;
}

.orange {
 background-color: #ed8936;
}

* {
 outline: none;
 box-sizing: border-box;
}

img {
 max-width: 100%;
}

body {
 background-color: var(--body-bg-color);
 font-family: var(--body-font);
 color: var(--body-color);
}

html {
 box-sizing: border-box;
 -webkit-font-smoothing: antialiased;
}

.app {
 display: flex;
 flex-direction: column;
 background-color: var(--theme-bg-color);
 max-width: 1600px;
 height: 100vh;
 margin: 0 auto;
 overflow: hidden;
}

.header {
 height: 80px;
 width: 100%;
 border-bottom: 1px solid var(--border-color);
 display: flex;
 align-items: center;
 padding: 0 20px;
}

.wrapper {
 width: 100%;
 display: flex;
 flex-grow: 1;
 overflow: hidden;
}

.conversation-area,
.detail-area {
 width: 340px;
 flex-shrink: 0;
}

.detail-area {
 border-left: 1px solid var(--border-color);
 margin-left: auto;
 padding: 30px 30px 0 30px;
 display: flex;
 flex-direction: column;
 overflow: auto;
}

.chat-area {
 flex-grow: 1;
}

.search-bar {
 height: 80px;
 z-index: 3;
 position: relative;
 margin-left: 280px;

 input {
  height: 100%;
  width: 100%;
  display: block;
  background-color: transparent;
  border: none;
  color: var(--body-color);
  padding: 0 54px;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 56.966 56.966' fill='%23c1c7cd'%3e%3cpath d='M55.146 51.887L41.588 37.786A22.926 22.926 0 0046.984 23c0-12.682-10.318-23-23-23s-23 10.318-23 23 10.318 23 23 23c4.761 0 9.298-1.436 13.177-4.162l13.661 14.208c.571.593 1.339.92 2.162.92.779 0 1.518-.297 2.079-.837a3.004 3.004 0 00.083-4.242zM23.984 6c9.374 0 17 7.626 17 17s-7.626 17-17 17-17-7.626-17-17 7.626-17 17-17z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-size: 16px;
  background-position: 25px 48%;
  font-family: var(--body-font);
  font-weight: 600;
  font-size: 15px;
  &::placeholder {
   color: var(--input-chat-color);
  }
 }
}

.logo {
 color: var(--theme-color);
 width: 38px;
 flex-shrink: 0;

 svg {
  width: 100%;
 }
}

.user-settings {
 display: flex;
 align-items: center;
 cursor: pointer;
 margin-left: auto;
 flex-shrink: 0;
 & > * + * {
  margin-left: 14px;
 }
}

.dark-light {
 width: 22px;
 height: 22px;
 color: var(--settings-icon-color);
 flex-shrink: 0;

 svg {
  width: 100%;
  fill: transparent;
  transition: 0.5s;
 }
}

.user-profile {
 width: 40px;
 height: 40px;
 border-radius: 50%;
}

.settings {
 color: var(--settings-icon-color);
 width: 22px;
 height: 22px;
 flex-shrink: 0;
}

.conversation-area {
 border-right: 1px solid var(--border-color);
 overflow-y: auto;
 overflow-x: hidden;
 display: flex;
 flex-direction: column;
 position: relative;
}

.msg-profile {
 width: 44px;
 height: 44px;
 border-radius: 50%;
 object-fit: cover;
 margin-right: 15px;
 &.group {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--border-color);

  svg {
   width: 60%;
  }
 }
}

.msg {
 display: flex;
 align-items: center;
 padding: 20px;
 cursor: pointer;
 transition: 0.2s;
 position: relative;
 &:hover {
  background-color: var(--msg-hover-bg);
 }
 &.active {
  background: var(--active-conversation-bg);
  border-left: 4px solid var(--theme-color);
 }
 &.online:before {
  content: "";
  position: absolute;
  background-color: #23be7e;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--theme-bg-color);
  left: 50px;
  bottom: 19px;
 }
}

.msg-username {
 margin-bottom: 4px;
 font-weight: 600;
 font-size: 15px;
}

.msg-detail {
 overflow: hidden;
}

.msg-content {
 font-weight: 500;
 font-size: 13px;
 display: flex;
}

.msg-message {
 white-space: nowrap;
 overflow: hidden;
 text-overflow: ellipsis;
 color: var(--msg-message);
}

.msg-date {
 font-size: 14px;
 color: var(--msg-date);
 margin-left: 3px;
 &:before {
  content: "•";
  margin-right: 2px;
 }
}

.add {
 position: sticky;
 bottom: 25px;
 background-color: var(--theme-color);
 width: 60px;
 height: 60px;
 border: 0;
 border-radius: 50%;
 background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-plus'%3e%3cpath d='M12 5v14M5 12h14'/%3e%3c/svg%3e");
 background-repeat: no-repeat;
 background-position: 50%;
 background-size: 28px;
 box-shadow: 0 0 16px var(--theme-color);
 margin: auto auto -55px;
 flex-shrink: 0;
 z-index: 1;
 cursor: pointer;
}

.overlay {
 position: sticky;
 bottom: 0;
 left: 0;
 width: 340px;
 flex-shrink: 0;
 background: var(--overlay-bg);
 height: 80px;
}

.chat-area {
 display: flex;
 flex-direction: column;
 overflow: auto;
 &-header {
  display: flex;
  position: sticky;
  top: 0;
  left: 0;
  z-index: 2;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  background: var(--chat-header-bg);
 }
 &-profile {
  width: 32px;
  border-radius: 50%;
  object-fit: cover;
 }
 &-title {
  font-size: 18px;
  font-weight: 600;
 }
 &-main {
  flex-grow: 1;
 }
}

.chat-msg-img {
 height: 40px;
 width: 40px;
 border-radius: 50%;
 object-fit: cover;
}

.chat-msg-profile {
 flex-shrink: 0;
 margin-top: auto;
 margin-bottom: -20px;
 position: relative;
}

.chat-msg-date {
 position: absolute;
 left: calc(100% + 12px);
 bottom: 0;
 font-size: 12px;
 font-weight: 600;
 color: var(--msg-date);
 white-space: nowrap;
}

.chat-msg {
 display: flex;
 padding: 0 20px 45px;
 &-content {
  margin-left: 12px;
  max-width: 70%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
 }
 &-text {
  background-color: var(--chat-text-bg);
  padding: 15px;
  border-radius: 20px 20px 20px 0;
  line-height: 1.5;
  font-size: 14px;
  font-weight: 500;
  & + & {
   margin-top: 10px;
  }
 }
}

.chat-msg-text {
 color: var(--chat-text-color);
}

.owner {
 flex-direction: row-reverse;
 .chat-msg-content {
  margin-left: 0;
  margin-right: 12px;
  align-items: flex-end;
 }
 .chat-msg-text {
  background-color: var(--theme-color);
  color: #fff;
  border-radius: 20px 20px 0 20px;
 }
 .chat-msg-date {
  left: auto;
  right: calc(100% + 12px);
 }
}

.chat-msg-text img {
 max-width: 300px;
 width: 100%;
}

.chat-area-footer {
 display: flex;
 border-top: 1px solid var(--border-color);
 width: 100%;
 padding: 10px 20px;
 align-items: center;
 background-color: var(--theme-bg-color);
 position: sticky;
 bottom: 0;
 left: 0;
}

.chat-area-footer svg {
 color: var(--settings-icon-color);
 width: 20px;
 flex-shrink: 0;
 cursor: pointer;
 &:hover {
  color: var(--settings-icon-hover);
 }

 & + svg {
  margin-left: 12px;
 }
}

.chat-area-footer input {
 border: none;
 color: var(--body-color);
 background-color: var(--input-bg);
 padding: 12px;
 border-radius: 6px;
 font-size: 15px;
 margin: 0 12px;
 width: 100%;
 &::placeholder {
  color: var(--input-chat-color);
 }
}

.detail-area-header {
 display: flex;
 flex-direction: column;
 align-items: center;

 .msg-profile {
  margin-right: 0;
  width: 60px;
  height: 60px;
  margin-bottom: 15px;
 }
}

.detail-title {
 font-size: 18px;
 font-weight: 600;
 margin-bottom: 10px;
}

.detail-subtitle {
 font-size: 12px;
 font-weight: 600;
 color: var(--msg-date);
}

.detail-button {
 border: 0;
 background-color: var(--button-bg-color);
 padding: 10px 14px;
 border-radius: 5px;
 color: var(--button-color);
 display: flex;
 align-items: center;
 justify-content: center;
 font-size: 14px;
 flex-grow: 1;
 font-weight: 500;
 svg {
  width: 18px;
  margin-right: 10px;
 }
 &:last-child {
  margin-left: 8px;
 }
}

.detail-buttons {
 margin-top: 20px;
 display: flex;
 width: 100%;
}

.detail-area input {
 background-color: transparent;
 border: none;
 width: 100%;
 color: var(--body-color);
 background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 56.966 56.966' fill='%23c1c7cd'%3e%3cpath d='M55.146 51.887L41.588 37.786A22.926 22.926 0 0046.984 23c0-12.682-10.318-23-23-23s-23 10.318-23 23 10.318 23 23 23c4.761 0 9.298-1.436 13.177-4.162l13.661 14.208c.571.593 1.339.92 2.162.92.779 0 1.518-.297 2.079-.837a3.004 3.004 0 00.083-4.242zM23.984 6c9.374 0 17 7.626 17 17s-7.626 17-17 17-17-7.626-17-17 7.626-17 17-17z'/%3e%3c/svg%3e");
 background-repeat: no-repeat;
 background-size: 16px;
 background-position: 100%;
 font-family: var(--body-font);
 font-weight: 600;
 font-size: 14px;
 border-bottom: 1px solid var(--border-color);
 padding: 14px 0;
 &::placeholder {
  color: var(--detail-font-color);
 }
}

.detail-changes {
 margin-top: 40px;
}

.detail-change {
 color: var(--detail-font-color);
 font-family: var(--body-font);
 font-weight: 600;
 font-size: 14px;
 border-bottom: 1px solid var(--border-color);
 padding: 14px 0;
 display: flex;
 svg {
  width: 16px;
  margin-left: auto;
 }
}

.colors {
 display: flex;
 margin-left: auto;
}

.color {
 width: 16px;
 height: 16px;
 border-radius: 50%;
 cursor: pointer;
 &.selected {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' stroke='%23fff' stroke-width='3' fill='none' stroke-linecap='round' stroke-linejoin='round' class='css-i6dzq1' viewBox='0 0 24 24'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E");
  background-size: 10px;
  background-position: center;
  background-repeat: no-repeat;
 }
 &:not(:last-child) {
  margin-right: 4px;
 }
}

.detail-photo-title {
 display: flex;
 align-items: center;

 svg {
  width: 16px;
 }
}

.detail-photos {
 margin-top: 30px;
 text-align: center;
}

.detail-photo-title {
 color: var(--detail-font-color);
 font-weight: 600;
 font-size: 14px;
 margin-bottom: 20px;
 svg {
  margin-right: 8px;
 }
}

.detail-photo-grid {
 display: grid;
 grid-template-columns: repeat(4, 1fr);
 grid-column-gap: 6px;
 grid-row-gap: 6px;
 grid-template-rows: repeat(3, 60px);

 img {
  height: 100%;
  width: 100%;
  object-fit: cover;
  border-radius: 8px;
  object-position: center;
 }
}

.view-more {
 color: var(--theme-color);
 font-weight: 600;
 font-size: 15px;
 margin: 25px 0;
}

.follow-me {
 text-decoration: none;
 font-size: 14px;
 width: calc(100% + 60px);
 margin-left: -30px;
 display: flex;
 align-items: center;
 margin-top: auto;
 overflow: hidden;
 color: #9c9cab;
 padding: 0 20px;
 height: 52px;
 flex-shrink: 0;
 position: relative;
 justify-content: center;
 svg {
  width: 16px;
  height: 16px;
  margin-right: 8px;
 }
}

.follow-text {
 display: flex;
 align-items: center;
 transition: 0.3s;
}

.follow-me:hover {
 .follow-text {
  transform: translateY(100%);
 }
 .developer {
  top: 0;
 }
}

.developer {
 position: absolute;
 color: var(--detail-font-color);
 font-weight: 600;
 left: 0;
 top: -100%;
 display: flex;
 transition: 0.3s;
 padding: 0 20px;
 align-items: center;
 justify-content: center;
 background-color: var(--developer-color);
 width: 100%;
 height: 100%;
}

.developer img {
 border-radius: 50%;
 width: 26px;
 height: 26px;
 object-fit: cover;
 margin-right: 10px;
}

.dark-mode {
 .search-bar input,
 .detail-area input {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 56.966 56.966' fill='%236f7073'%3e%3cpath d='M55.146 51.887L41.588 37.786A22.926 22.926 0 0046.984 23c0-12.682-10.318-23-23-23s-23 10.318-23 23 10.318 23 23 23c4.761 0 9.298-1.436 13.177-4.162l13.661 14.208c.571.593 1.339.92 2.162.92.779 0 1.518-.297 2.079-.837a3.004 3.004 0 00.083-4.242zM23.984 6c9.374 0 17 7.626 17 17s-7.626 17-17 17-17-7.626-17-17 7.626-17 17-17z'/%3e%3c/svg%3e");
 }
 .dark-light svg {
  fill: #ffce45;
  stroke: #ffce45;
 }
 .chat-area-group span {
  color: #d1d1d2;
 }
}

.chat-area-group {
 flex-shrink: 0;
 display: flex;
 * {
  border: 2px solid var(--theme-bg-color);
 }
 * + * {
  margin-left: -5px;
 }

 span {
  width: 32px;
  height: 32px;
  background-color: var(--button-bg-color);
  color: var(--theme-color);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
 }
}

@media (max-width: 1120px) {
 .detail-area {
  display: none;
 }
}

@media (max-width: 780px) {
 .conversation-area {
  display: none;
 }
 .search-bar {
  margin-left: 0;
  flex-grow: 1;
  input {
   padding-right: 10px;
  }
 }
}

              
            
!

JS

              
                const toggleButton = document.querySelector('.dark-light');
const colors = document.querySelectorAll('.color');

colors.forEach(color => {
  color.addEventListener('click', (e) => {
    colors.forEach(c => c.classList.remove('selected'));
    const theme = color.getAttribute('data-color');
    document.body.setAttribute('data-theme', theme);
    color.classList.add('selected');
  });
});

toggleButton.addEventListener('click', () => {
  document.body.classList.toggle('dark-mode');
});
              
            
!
999px

Console