body {
    min-height: 75rem;
    padding-top: 4.5rem;
}

/* 768px is de breedte van een ipad-scherm in portrait mode */
/* 1024px is de breedte van een ipad-scherm in landscape mode */
@media (min-width: 1025px) {
    .sidebar {
        position: fixed;
        top: 50px;
        height: 100%;
        /*bottom: 0;*/
        left: 0;
        z-index: 1000;
        display: block;
        padding: 20px;
        overflow-x: hidden;
        overflow-y: auto; /* Scrollable contents if viewport is shorter than content. */
        background-color: #f5f5f5;
        border-right: 1px solid #eee;
    }
}

@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        top: 100px;
        height: 100%;
        /*bottom: 0;*/
        left: 0;
        z-index: 1000;
        display: block;
        padding: 20px;
        overflow-x: hidden;
        overflow-y: auto; /* Scrollable contents if viewport is shorter than content. */
        background-color: #f5f5f5;
        border-right: 1px solid #eee;
    }
}
.center {
      display: block;
      margin-left: auto;
      margin-right: auto;
      width: 18rem;
    }