index.css

@import url('https://fonts.googleapis.com/css?family=Mukta:700');
* {
    box-sizing: border-box;
}
*::before, *::after {
    box-sizing: border-box;
}
body {
    font-family: 'Mukta', sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    min-height: 80vh;
    background: #f3f8fa;
}

.main {
    display: flex;
    flex-direction: column;
    padding: 0 20px;
}

button {
    position: relative;
    display: inline-block;
    cursor: pointer;
    outline: none;
    border: 0;
    vertical-align: middle;
    text-decoration: none;
    background: transparent;
    padding: 0;
    font-size: inherit;
    font-family: inherit;
}
button.learn-more {
    width: 12rem;
    height: auto;
}
button.learn-more .circle {
    transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
    position: relative;
    display: block;
    margin: 0;
    width: 3rem;
    height: 3rem;
    background: #282936;
    border-radius: 1.625rem;
}
button.learn-more .circle .icon {
    transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto;
    background: #fff;
}
button.learn-more .circle .icon.arrow {
    transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
    left: 0.625rem;
    width: 1.125rem;
    height: 0.125rem;
    background: none;
}
button.learn-more .circle .icon.arrow::before {
    position: absolute;
    content: '';
    top: -0.25rem;
    right: 0.0625rem;
    width: 0.625rem;
    height: 0.625rem;
    border-top: 0.125rem solid #fff;
    border-right: 0.125rem solid #fff;
    transform: rotate(45deg);
}
button.learn-more .button-text {
    transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 0.75rem 0;
    margin: 0 0 0 1.85rem;
    color: #282936;
    font-weight: 700;
    line-height: 1.6;
    text-align: center;
    text-transform: uppercase;
}

button:hover .circle,
button.active .circle {
    width: 100%;
}

button:hover .circle .icon.arrow,
button.active .circle .icon.arrow {
    background: #fff;
    transform: translate(1rem, 0);
}

button:hover .button-text,
button.active .button-text {
    color: #fff;
}

@supports (display: grid) {
}


.loader {
    border: 4px solid #f3f3f3;
    border-radius: 50%;
    border-top: 4px solid #3498db;
    width: 20px;
    height: 20px;
    -webkit-animation: spin 1.4s ease-in-out infinite; /* Safari */
    animation: spin 1.4s ease-in-out infinite;
    display: none;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto;
    left: 20px;
}

/* Safari */
@-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}