.sltb-box{
max-width:600px;
padding:20px;
background:#f8f8f8;
border:1px solid #ddd;
}

.sltb-box label{
display:block;
margin-top:10px;
}

.sltb-box input, .sltb-box select{
width:100%;
padding:6px;
}

#calc{
margin-top:15px;
padding:10px 18px;
background:#0073aa;
color:white;
border:none;
cursor:pointer;
}