.sidebar {
    float: none;
    min-height: 200px;
    width: 100%;
    padding-left: 15px;
    padding-right: 15px;
    margin-left: 0px;
}
@media only screen and (min-width : 768px) {
    .sidebar {
        float: left;
        min-height: 700px;
        width: 25%;
        padding-left: 5px;
        padding-right: 5px;
        margin-left: 0px;
    }
}
@media only screen and (min-width : 1024px) {
    .sidebar {
        float: left;
        min-height: 700px;
        width: 15%;
        padding-left: 5px;
        padding-right: 5px;
    }
}