JSFiddle - React, Tailwind, and code Playground

by Mykola Dolynskyi

HTML

<div class="parent" style="width: 300px; height: 300px; background-color: white">
 <div class="button_wrap">
 <div class="slide">Contact us!</div><div id="float-button-contact-us"><div></div></div>
 </div>
</div>

CSS

body {    
    --colorGinFocus:#FFC6C5;
    --colorGinAppBackground: #fbf8f8;
    }
    
.button_wrap {
    position: fixed;
    right: 20px;
    bottom: 20px;
    border-radius: 50px;
    z-index: 999999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide {
  width: 0px;
  height: 0px;
}

#float-button-contact-us>div {
    position: relative;
}

#float-button-contact-us>div::before {
    content: " ";
    width: 37px;
    height: 37px;
    background-image: url("https://djsite.youpal.ninja/themes/custom/djt/logo.svg");
    background-repeat: no-repeat;
    background-size: 100%;
    position: absolute;
    transform: translate(-48%, -40%);
    filter: brightness(0) invert(1);
    transition: all 0.5s ease-in-out;
}

#float-button-contact-us:hover>div::before {
    filter: none;
}

#float-button-contact-us {
    position: relative;
    right: 20px;
    bottom: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50px;
    z-index: 999999;
    transition: all 0.5s ease-in-out;
    background-color: var(--colorGinFocus);
    border: 10px solid transparent;
    box-shadow: 5px 6px 12px 4px rgba(0, 0, 0, 0.62);
    -webkit-box-shadow: 5px 6px 12px 4px rgba(0, 0, 0, 0.62);
    -moz-box-shadow: 5px 6px 12px 4px rgba(0, 0, 0, 0.62);
    display: flex;
    align-items: center;
    justify-content: center;
}

#float-button-contact-us::before {
    z-index: -1;
}

#float-button-contact-us:hover {
    background-color: var(--colorGinAppBackground);
    border: 10px solid var(--colorGinFocus);
    cursor: pointer;
}

#float-button-contact-us:after {
    z-index: -2;
    content: "";
    position: absolute;
    display: block;
    border-radius: 50%;
    height: 0%;
    width: 0%;
    margin: auto;
    background: var(--colorGinAppBackground);
    top: 50%;
    left: 50%;
    transform: translateY(-50%) translateX(-50%);
    transition: all 0.5s ease-in-out;
}

#float-button-contact-us:hover:after {
    width: 100%;
    height: 100%;
}