.sidebar {
float: right;
width: 30%;
height: auto;
border: 1px solid white;
margin-left: auto;
margin-right: auto;
}

.sidebar-bottom {
display: none;
}

@media screen and (max-width: 480px) {

.sidebar {
display: none;
}

.sidebar-bottom {
display: block;
position: relative;
width: 90%;
height: auto;
margin-left: auto;
margin-right: auto;
margin-bottom: 20px;
border: 1px solid white;
background: white;
}
}