.side-bar {
    position: fixed;
    z-index: 100;
    right: 50%;
    top: 40%;
    width: 50px;
    margin-right: -652px;
}

.side-bar .side-bar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    cursor: pointer;
    color: #4d7198;
    background-color: #fff;
    font-size: 12px;
    padding: 7px;
    text-align: center;
    border-radius: 3px;
    border: 1px solid #4d7198;
    transition: all .3s;
}

.side-bar .side-bar-btn:hover {
    background-color: #4d7198;
    color: #fff;
    transition: all .3s;
}

.sub-side-bar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 110px;
    height: 30px;
    cursor: pointer;
    color: #4d7198;
    background-color: #fff;
    font-size: 12px;
    padding: 7px;
    text-align: center;
    border-radius: 3px;
    border: 1px solid #4d7198;
    transition: all .3s;
    margin-top: 5px;
}

.side-bar .sub-side-bar-btn:hover {
    background-color: #4d7198;
    color: #fff;
    transition: all .3s;
}

.side-bar .toTop-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    cursor: pointer;
    position: relative;
    color: #4d7198;
    background-color: #fff;
    font-size: 12px;
    padding: 7px;
    text-align: center;
    border-radius: 3px;
    visibility: hidden;
    transition: all .3s;
}

.side-bar .toTop-btn i.icon {
    font-size: 24px;
    margin: 0;
}

.side-bar .toTop-btn img {
    width: 50px;
}

.side-bar .toTop-btn:hover {
    background-color: #4d7198;
    color: #fff;
    transition: all .3s;
}