/*
     Folha de exercícios nº 8
    (retirado do exame de PTW de 2009/2010)
    
                Pontos Chave
        XHTML + CSS + Javascript + DOM

*/

*{
    padding: 0;
    margin: 0;
        
}



#caixa{
    border: 1px solid black;
    width: 240px;
    height: 345px;
    text-align: center;
    align-content: center;
    margin-top: 10px;
    margin-left: auto;
    margin-right: auto;
    
}

header > h1{
    margin-top: 10px;
    margin-bottom: 20px;
    color: red;
    font-family: verdana;
    font-size: 16px;
}

table{
    margin: 0 auto 0 auto;
}

form input.num{
    width: 50px;
    height: 50px;
    color: white;
    background-color: green;
     display: block;
    
}

form input.num:hover{
    background-color: dimgrey;
}