.activity {
    background: cornsilk;
    border-style: solid;
    border-width: 1px;
    margin: 10px;
}

.activityAnswer {
    background: lightBlue;
    border-style: solid;
    border-width: 1px;
    margin: 10px;
}

.programmingTip {
    background: lightGreen;
}

.csTip {
    background: lightPink;
}

.highlight {
    background: beige;
}