body {
    background-image: url("/img/geometry2.png")
}
.demo .row .col {
    background-color: #eee;    
}
.demo .row .col:nth-child(even) {
    background-color: #ddd;
}
.docs {
    margin-top: 2rem;
    margin-bottom: 2rem;
}
.summary a {
    color: #41403e;    
}
.to-top {
    opacity: 1;
    display: inline-block;
    padding: 1em;
    position: fixed;
    bottom: 1em;
    right: 1em
}
.to-top .paper-btn {
    padding: .6em 1em;
    background: #fff;
    border-top-left-radius: 185px 160px;
    border-top-right-radius: 200px 195px;
    border-bottom-right-radius: 160px 195px;
    border-bottom-left-radius: 185px 190px
}
.demo-title:hover + .to-top {
    opacity: 0
}