body{
    background-color: darkturquoise;
}
h3{
    text-align: center;
}
#content,#result,#check{
    border-style: dashed;
    width: 30%;
    margin-left: 35%;
    margin-right: 35%;
    padding: 10px;
}
#result{
    border-style: none;
    margin-top: 5%;
    margin-bottom: 5%;
}
#check{
    border-style: none;
    margin-top: 5%;
    margin-bottom: 5%;
}
table{
    border-top:1px solid #999;
    border-left:1px solid #999;
    border-spacing:0;
}
table td{
    border-bottom:1px solid #999;
    border-right:1px solid #999;
}