body {
    font-family: 'Rubik', sans-serif;
    font-size: 14px;
}
.main{
    display: flex;
    width: auto;
    height: 100%;
    background: #f7f7f7;
    margin: 0 auto;
    overflow: auto;
}

.single .left{
    padding: 1em;
    flex-grow: 1;
    height: 90vh;
    position: relative;

    width: 100ch; /* Remove this, just for demo */
    top: 0;
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid #000;
}

.single .right{
    padding: 1em;
    flex-grow: 1;
    display: flex;
    height: 90vh;
    position: relative;
    top: 0;
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid #000;
}
.summary {
    padding-bottom:1em;
}
.part .time {
    color:#CCC;
    cursor:pointer;
}

.multiple .left{
        column-count: 5;
        column-width: 20vw;
        widows: 3;
        orphans: 3;
        gap: 1.6em;
        column-rule: 2px dashed #666;

    padding: 1em;
    flex-grow: 1;
    position: relative;
    top: 0;
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid #000;
}

.multiple .right{
/*
    padding: 1em;
    flex-grow: 1;
    display: flex;
    height: 90vh;
    min-width: 30vw;
    position: relative;
    top: 0;
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid #000;
*/
}
.topic .text {
    display: block;
}
.topic .name {
    color: #CCC;
    margin-left: 1.6em;
}
.topic .page {
    color:#9999EE;
    cursor:pointer;
}
.single .topic .pages {
    margin-left: 1.6em;
}