* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}
/*style the button*/
.go-up {
    position: fixed;
    width: 3.2rem;
    height: 3.2rem;
    background-color: #eee;
    bottom: 2rem;
    left: 2rem;
    border-radius: 100%;
    animation: fade 1s;
    animation: pulse 2s infinite;
    display: none;
}
.go-up:hover {
    cursor: pointer;
}
.go-up i {
    color: cornflowerblue;
    font-size: 1.5rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
/*add pulse animation*/
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(253, 87, 191, 0.99);
    }
    70% {
        box-shadow: 0 0 0 1rem rgba(253, 87, 191, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(253, 87, 191, 0);
    }
}