.left-menu-container {
    width: 22%;
    height: 100%;
    float: left;
    overflow-y: auto;
    border-right: 1px solid #E3E3E3;
    transition: width 0.3s linear;
    -ms-transition: width 0.3s linear;
    -moz-transition: width 0.3s linear;
    -webkit-transition: width 0.3s linear;
}

    .left-menu-container.closed {
        width: 0px;
        transition: width 0.3s linear;
        -ms-transition: width 0.3s linear;
        -moz-transition: width 0.3s linear;
        -webkit-transition: width 0.3s linear;
    }