.sidebar-shadow {
    opacity: 0;
    background-color: black;
    pointer-events: none;
    transition: opacity 200ms ease-out;
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    z-index: 2;
}
.sidebar-on .sidebar-shadow {
    opacity: .3;
    pointer-events: initial;
}

.sidebar {
    transition: left 200ms ease-out;
    position: fixed;
    left: 100%;
    top: 0;
    height: 100%;
    width: calc(100% - 700px);
    padding: 1em;
    background-color: #fff;
    z-index: 3;
    overflow-y: auto;
}
.sidebar-on .sidebar {
    left: 700px;
}

.sidebar-flow-item {
    display: block;
}
.sidebar-flow-item .box {
    margin: 1em;
    width: calc(100% - 2em);
}