body {
    font-family: Arial, sans-serif;
    margin: 40px;
}
.calendar {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}
.calendar td, .calendar th {
    border: 1px solid #aaa;
    width: 14.28%;
    height: 60px;
    text-align: center;
    vertical-align: top;
    cursor: pointer;
    position: relative;
}
.calendar td div.entry {
    font-size: 12px;
    margin: 2px;
    padding: 2px;
    border-radius: 3px;
    color: white;
}
.entry.blue { background-color: #3399ff; }
.entry.red { background-color: #ff4444; }
select, button {
    font-size: 16px;
    margin-top: 10px;
}