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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <p>Click the <svg viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg></p>

<footer>
    <span class="footer-left"><svg viewBox="0 0 18 18"><path d="M2 13.5h14V12H2v1.5zm0-4h14V8H2v1.5zM2 4v1.5h14V4H2z"/></svg></span>
    
    <div class="add-menu closed">
        <span class="add-btn add-file"><svg viewBox="0 0 18 18"><path d="M13 14c0 2.21-1.79 4-4 4s-4-1.79-4-4V3c0-1.66 1.34-3 3-3s3 1.34 3 3v9c0 1.1-.9 2-2 2s-2-.9-2-2V4h1v8c0 .55.45 1 1 1s1-.45 1-1V3c0-1.1-.9-2-2-2s-2 .9-2 2v11c0 1.66 1.34 3 3 3s3-1.34 3-3V4h1v10z"/></svg></span>
        <span class="add-btn add-list"><svg viewBox="0 0 24 24"><path d="M4 14h4v-4H4v4zm0 5h4v-4H4v4zM4 9h4V5H4v4zm5 5h12v-4H9v4zm0 5h12v-4H9v4zM9 5v4h12V5H9z"/></svg></span>
        <span class="add-btn open-close"><svg viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg></span>
        <span class="add-btn add-recording"><svg viewBox="0 0 24 24"><path d="M12 14c1.66 0 2.99-1.34 2.99-3L15 5c0-1.66-1.34-3-3-3S9 3.34 9 5v6c0 1.66 1.34 3 3 3zm5.3-3c0 3-2.54 5.1-5.3 5.1S6.7 14 6.7 11H5c0 3.41 2.72 6.23 6 6.72V21h2v-3.28c3.28-.48 6-3.3 6-6.72h-1.7z"/></svg></span>
        <span class="add-btn add-note"><svg viewBox="0 0 24 24"><path d="M3 17.25V21h3.75L17.81 9.94l-3.75-3.75L3 17.25zM20.71 7.04c.39-.39.39-1.02 0-1.41l-2.34-2.34c-.39-.39-1.02-.39-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83z"/></svg></span>
    </div>
    
    <span class="footer-right">
        <span><svg viewBox="0 0 24 24"><path d="M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z"/></svg></span>
        <span><svg viewBox="0 0 18 18"><path d="M9 5.5c.83 0 1.5-.67 1.5-1.5S9.83 2.5 9 2.5 7.5 3.17 7.5 4 8.17 5.5 9 5.5zm0 2c-.83 0-1.5.67-1.5 1.5s.67 1.5 1.5 1.5 1.5-.67 1.5-1.5S9.83 7.5 9 7.5zm0 5c-.83 0-1.5.67-1.5 1.5s.67 1.5 1.5 1.5 1.5-.67 1.5-1.5-.67-1.5-1.5-1.5z"/></svg></span>
    </span>
    
    <div class="footer-bg"></div>
</footer>
            
          
!

CSS

            
              @import url('https://fonts.googleapis.com/css?family=Roboto');

* { box-sizing: border-box; }

:root {
    --bg: #F5F5F6;
    --primary: #d81b60;
    --secondary: #4a148c;
    --icon-color: white;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg);
    height: 100vh;
    margin: 0;
}

p {
    font-size: 2em;
    padding-left: 1em;
}
svg {
    width: 1em;
}

footer {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    padding: 1.2em 0.7em;
    user-select: none;
}

.closed ~ .footer-bg::after {
    width: 70px;
}
.footer-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
    
    &::after {
        content: '';
        position: absolute;
        left: 50%; 
        top: 0px;
        transform: translate(-50%, -85%);
        border-radius: 50px;
        width: 240px;
        height: 150px;
        box-shadow: 0px 0px 0px 2000px var(--primary);
        transition: width 0.3s;
    }
}

.add-menu {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translate(-50%, -70%);
    background-color: var(--secondary);
    width: 200px;
    height: 50px;
    border-radius: 99999px;
    
    transition: width 0.3s;
}

footer svg {
    width: 30px;
    cursor: pointer;
    fill: var(--icon-color);
}

.closed .add-btn:not(.open-close) {
    transform-origin: top left;
    transform: scale(0) translate(-50%, -50%);
}
.closed .open-close {
    transform: translate(-50%, -50%) rotate(0deg);
}
.add-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transition: 0.3s;
}
.add-file {
    transform: scale(1) translate(-300%, -50%);
}
.add-list {
    transform: scale(1) translate(-175%, -50%);
}
.open-close {
    transform: translate(-50%, -50%) rotate(45deg);
}
.add-recording {
    transform: scale(1) translate(75%, -50%);
}
.add-note {
    transform: scale(1) translate(200%, -50%);
}

.add-menu.closed {
    width: 50px;
}

.footer-right {
    float: right;
}
            
          
!

JS

            
              const addBtn = document.querySelector(".add-menu");
addBtn.addEventListener("click", e => {
    addBtn.classList.toggle("closed");
});
            
          
!
999px

Console