.calendar-header.hours {
    grid-template-columns: 120px;
}

.calendar-weekday-column {
    background: white;
    position: relative;
    gap: 1px;

    display: grid;
}

.test-entry {
    position: initial;
    background: yellow;

    padding: 0px 5px;
    top:    calc(100% / 23 * 11 + 1px);
    height: calc(100% / 23 * 3 - 1px);
}

.test-entry.two {
    background: red;

    top:    calc(100% / 23 * 1.1 + 1px);
    height: calc(100% / 23 * 3 - 1px);
}