#sidebar {
    position        : absolute;
    top             : 0px;
    left            : 0px;
    height          : calc(100% - 48px);
    width           : 180px;
    margin-top      : 156px;
    background-color: #F0F0F0;
}

#sidebar.sticked {
    position  : fixed;
    top       : 48px;
    left      : 0px;
    margin-top: 0px;
}

#sidebar .button {
    width: 100%;
}