.scroll-to-top a {
width: 40px;
height: 40px;
background: #000;
color: #fff;
text-align: center;
font-size: 20px;
transition: 0.3s;
border-radius: 50%;
vertical-align: middle;
display: flex;
align-items: center;
justify-content: center;
text-decoration: none;
}
.scroll-to-top:hover a {
background: #ccc;
color: #000;
}
.scroll-to-top { position:  fixed;
bottom: 4%;
z-index: 999;
}