body {
    margin-top: 100px;
    color: #000;
    text-align: center;
}

h1 {
    font: 1.5em 'Roboto', sans-serif;
    margin-bottom: 30px;
}

.spin {
    display: inline-block;
    width: 5rem;
    aspect-ratio: 1/1;
    border: 3px solid rgba(0, 0, 255, .3);
    border-radius: 50%;
    border-top-color: rgba(0, 0, 255, .75);
    animation: spin 1s ease-in-out infinite;
    -webkit-animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

@-webkit-keyframes spin {
    to {
        -webkit-transform: rotate(360deg);
    }
}