main.css

.page {
    margin-bottom: 2em;
}

.timetable-row {
    display: flex;
    flex-direction: column;
}

.timetable-cell {
    display: flex;
    flex-direction: row;
    float: left;
}

.timetable-cell-index {
    border: 1px solid black;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.lesson {
    flex: 1 1 0;
    border: 1px solid black;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 10px 0;
}

.day-of-week {
    text-align: center;
    font-family: sans-serif;
}

nav {
    position: fixed;
    bottom: 0;
    display: flex;
    flex-direction: row;
    width: calc(100vw - 16px);
    background-color: white;
    height: 2em;
}

nav a {
    border-top: 2px solid transparent;
    flex: 1 1 0;
    text-align: center;
    color: #aaa;
    line-height: calc(2em - 4px);
    text-decoration: none;
}

nav a.active {  
    border-top: 2px solid #fff034;
    color: #000;
}


/* SUBSTITUTIONS */

td {
    border: 1px solid black; 
    text-align: center;
}

table {
    width: 100%;
    border-collapse: collapse;
}