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HTML

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Adding Classes

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <a href="https://youtu.be/D0l9EFWWk9M" target="_blank" data-keyframers-credit style="color: #000"></a>
<script src="https://codepen.io/shshaw/pen/QmZYMG.js"></script>

<div id="app" data-state="send">
  <div class="ui-layer" data-show="send">
    <button class="ui-button" style="--color: #24A5EF">
      <div class="ui-bg" data-flip-key="bg"></div>
      <span>Send</span>
    </button>
  </div>
  <div class="ui-layer" data-show="sending">
    <div class="ui-progress" data-flip-key="bg">
    </div>
  </div>
  <div class="ui-layer" data-show="sent">
    <button class="ui-button" style="--color: #20D280">
      <span>Sent</span>
    </button>
  </div>
  <div class="ui-layer -error" data-show="error">
    <div class="ui-message">
      <div class="ui-title">Error</div>
      <div class="ui-subtext">
        WIFI no connected dumb dumb
      </div>
    </div>

    <div class="ui-goo">
      <div class="ui-bg" data-flip-key="bg"></div>
      <button class="ui-button -icon -retry" data-click="RETRY">
        <span>⟲</span>
      </button>
      <button class="ui-button -icon -cancel" data-click="CANCEL">
        <span>✕</span>
      </button>
    </div>

  </div>
</div>

<svg class="goo-filter" viewBox="0 0 1 1">
  <filter id="goo">
    <feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur" />
    <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 50 -20" result="goo" />
    <feBlend in="SourceGraphic" in2="goo" />
  </filter>
</svg>
!

CSS 

              
                
$color-blue: #24A5EF;

#app {
  font-size: 2rem;
  font-family: "Helvetica Neue", sans-serif;
}


/* ---------------------------------- */

#app {
  display: flex;
}

.ui-layer {
  width: 100%;
  margin-right: -100%;

  display: flex;
  justify-content: center;
  align-items: center;
  // position: absolute;
  // top: 0;
  // left: 0;
  // width: 100%;
  // height: 100%;
  display: none;

  &[data-active="true"] {
    display: flex;
  }

}

/* ---------------------------------- */

.ui-button {
  appearance: none;
  background: transparent;
  padding: 0 3rem;
  border-radius: 3rem;
  border: 2px solid #DDDDDD;
  letter-spacing: 1px;
  color: var(--color);
  display: block;
  margin: auto;
  cursor: pointer;
  height: 5rem;

  &.-icon {
    width: 5rem;
    padding: 0;
    color: transparent;
    text-shadow: 0 0 0 white;
  }
}

/* ---------------------------------- */

.ui-progress {
  --progress: 0%;
  height: .5rem;
  width: 15rem;
  background-color: #DDDDDD;
  border-radius: .5rem;
  overflow: hidden;

  [data-active] & {
    animation: fake-load 3s linear infinite alternate;

    @keyframes fake-load {
      25% { --progress: 30%; }
      40% { --progress: 50%; }
      60% { --progress: 80%; }
      80% { --progress: 100%; }
      100% { --progress: 65%; }
    }
  }

  &:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: $color-blue;
    border-radius: inherit;
    transform: translateX(calc(-100% + var(--progress)));
    transition-duration: .6s;
    z-index: 5;
  }

}

/* ---------------------------------- */

.ui-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg);
}

/* ---------------------------------- */

.goo-filter {
  position: absolute;
  visibility: hidden;
}

.-error {
  text-align: center;
  padding: 1rem 7rem;
  align-items: center;

  .ui-message { z-index: 3; }

  .ui-goo {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-between;
    filter: url("#goo");
  }

  .ui-bg { 
    left: 0;
    right: 0;
    width: 70%;
    margin: auto;
    height: 100%;
    padding: 2.5rem;
    z-index: 2;
    border-radius: 6rem;
    pointer-events: none;
  }

  .ui-button {
    margin: 0;
    border: none;
    overflow: hidden;

    span { 
      display: block; 
    }


    &.-retry {
      transform: translateX(100%);
      opacity: 0;

      span { transform: translateX(-100%); }
    }
    &.-cancel {
      transform: translateX(-100%);
      opacity: 0;
      span { transform: translateX(100%); }
    }
  }


  .ui-bg,
  .ui-button,
  .ui-button span {
    background-color: #E95D5D;
    animation-duration: 1s;
    animation-delay: 1s;
    animation-timing-function: cubic-bezier(.5, 0, .5, 1);
    animation-fill-mode: both;
  }

  &[data-active] {

    .ui-bg {
      animation-name: goo-scale-down;
      @keyframes goo-scale-down {
        96% { transform: scale(1,0);  opacity: 1; }
        98% { opacity: 0; }
        100% { transform: scale(1.4,1); opacity: 0; }
      }
    }

    .ui-button,
    .ui-button span {
      animation-name: error-button-in;
      @keyframes error-button-in {
        20% { opacity: 1; }
        100% { transform: translateX(0%); opacity: 1 }
      }
    }
  }

}

.ui-title { 
  letter-spacing: 1px;
  color: var(--color);
}

.ui-subtext {
  font-size: .5rem;
  letter-spacing: .5px;
}


/* ---------------------------------- */

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

*, *:before, *:after {
  position: relative;
  box-sizing: border-box;
  transition: all .4s cubic-bezier(.5, 0, .5, 1);
}
!

JS 

              
                console.clear();

// FLIPPING!!!!
const flipping = new Flipping({
  duration: 400
});

const elApp = document.querySelector("#app");
const elButtons = document.querySelectorAll(".ui-button");

function activate(state) {
  flipping.read();
  elApp.dataset.state = state;

  document.querySelectorAll("[data-active]").forEach(el => {
    el.dataset.active = false;
  });

  document.querySelectorAll(`[data-show~="${state}"]`).forEach(el => {
    el.dataset.active = true;
  });
  flipping.flip();
}

const states = {
  send: {
    on: {
      CLICK: "sending"
    }
  },
  sending: {
    onEntry: () => {
      setTimeout(() => {
        if (Math.random() < 0.3) {
          send("SENT");
        } else {
          send("ERROR");
        }
      }, 2000);
    },
    on: {
      SENT: "sent",
      ERROR: "error"
    }
  },
  error: {
    on: {
      RETRY: "sending",
      CANCEL: "send",
    }
  },
  sent: {
    on: {
      CLICK: "send"
    }
  }
};

const machine = {
  initial: elApp.dataset.state,
  states
};

let currentState = machine.initial;

function send(event) {
  const nextState =
    // get the next state based on the event
    // get the current state
    machine.states[currentState].on[event] || currentState;

  if (currentState !== nextState) {
    const entryAction = machine.states[nextState].onEntry;

    if (entryAction) {
      entryAction();
    }
  }

  activate(nextState);
  currentState = nextState;
}

activate(currentState);

[...elButtons].forEach(el => {
  el.addEventListener("click", () => {
    send(el.dataset.click || "CLICK");
  });
});
!
999px

Console