body {
    font-family: Helvetica, Arial, sans-serif
}
.main {
    display: flex;
    flex-direction: row;
    align-items: stretch;
}
.main .zone div {
    padding: 8px;
}
.heading {
    text-align: center;
    font-weight: bold;
}
.heading .offset {
    font-size: 80%;
    font-weight: normal;
    margin-left: 1em;
}
.offset {
    background-color: wheat;
}
.localZone {
    background-color: thistle;
}
.timezone-odd {
    background-color: lightgreen;
}
.timezone-even {
    background-color: lightskyblue;
}
.time {
    text-align: right;
}
.marker {
    border: 2px solid maroon;
    color: maroon;
    font-weight: bold;
}
.local .marker {
    background-color: maroon;
    color: white;
}
.tomorrow {
    background-color: lightskyblue;
}
.yesterday {
    background-color: gainsboro;
}
.controls {
    margin: 0.5rem;
}