body{
    width: 60%;
    margin: auto;
    padding: 20px 0 40px;
}

h2{
    text-align: center;
}
h3{
    color: #366;
}
div#input{
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #696;
}
input {
    width: 40px;
    padding: 0 4px;
    text-align: center;
}
.box{
    display: inline-block;
    border: 1px solid #fcc;
    border-radius: 3px;
    padding: 2px 6px;
    margin: 6px;
    cursor: pointer;
}
.box:hover,
.box.active{
    background-color: #e91e63;
    color: white;
}
#confirm{
    width: 80px;
    height: 36px;
    line-height: 36px;
    margin: auto;
    margin-top: 8px;
    background-color: #fff;
    text-align: center;
    cursor: pointer;
    border: 1px solid #888;
    border-radius: 4px;;
}
#confirm:hover{
    background-color: #696;
}

table{
    width: 100%;
    margin: 10px auto;
    border-collapse: collapse;
}
th,td{
    width: 16.666%;
    border: 1px solid #888;
    text-align: center;
}

.calculating{
    text-align: center;
    padding: 5px;
    color:#f00;
}