.scrollup {
    position: fixed;
    top: 0;
    right: 25px;
    width: 42px;
    height: 42px;
    line-height: 42px;
    padding: 0;
    font-size: 20px;
    text-align: center;
    cursor: pointer;
    color: var(--sp-white);
    background-color: var(--sp-primary);
    border: none;
    outline: none;
    border-bottom-left-radius: 50%;
    border-top-left-radius: 50%;
    border-bottom-right-radius: 50%;
    box-shadow: 0 0 12px 0 rgba(0, 0, 0, .2);
    -webkit-transition: .9s;
    transition: .9s;
    z-index: 99;
    visibility: hidden;
    opacity: 0;
}

.scrollup i {
    display: inline-block;
    -webkit-transition: all .5s;
    -o-transition: all .5s;
    transition: all .5s;
}

.scrollup.is-active {
    top: 98%;
    -webkit-transform: translateY(-98%);
    transform: translateY(-98%);
    opacity: 1;
    visibility: visible;
}

.scrollup.is-active:hover,
.scrollup.is-active:focus {
    color: var(--sp-white);
    transform: translateY(-98%) rotate(-45deg);
    -webkit-transform: translateY(-98%) rotate(-45deg);
    -moz-transform: translateY(-98%) rotate(-45deg);
    -o-transform: translateY(-98%) rotate(-45deg);
    -ms-transform: translateY(-98%) rotate(-45deg);
}

.scrollup.is-active:hover i,
.scrollup.is-active:focus i {
    transform: translateY(0) rotate(45deg);
    -webkit-transform: translateY(0) rotate(45deg);
    -moz-transform: translateY(0) rotate(45deg);
    -o-transform: translateY(0) rotate(45deg);
    -ms-transform: translateY(0) rotate(45deg);
}