#totopBtn {
    display: none;
    position: fixed;
    bottom: 120px;
    right: 30px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: #000;
    color: white;
    cursor: pointer;
    padding: 0;
    border-radius: 8px;
    font-size: 18px;
    width: 50px;
    height: 50px;
}

#totopBtn:hover {
    background-color: #666;
}

.totopBtn {
    position: relative;
    background: #88b7d5;
    border: 4px solid #c2e1f5;
}

.totopBtn:after,
.totopBtn:before {
    bottom: 100%;
    left: 50%;
    border: solid transparent;
    content: "";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
}

.totopBtn:after {
    border-color: rgba(136, 183, 213, 0);
    border-bottom-color: #88b7d5;
    border-width: 10px;
    margin-left: -10px;
}

.totopBtn:before {
    border-color: rgba(194, 225, 245, 0);
    border-bottom-color: #c2e1f5;
    border-width: 16px;
    margin-left: -16px;
}

#totopBtn i {
    font-size: 24px;
}