#wcc-calculator { 
    max-width: 700px; 
    margin:20px auto; 
    font-family: Arial, sans-serif; 
}
#wcc-calculator table { 
    width:100%; 
    border-collapse: collapse; 
    margin-bottom:20px; 
}
#wcc-calculator th, #wcc-calculator td { 
    border:1px solid #ccc; 
    padding:8px; 
    text-align:center; 
}
#wcc-calculator h3 { 
    text-align:right; 
}