.cuadrado {
    margin:4px;
    border:solid silver 1px;
    width:50px;
    height:50px;
    font-size:40px;
    text-align:center;
    }

.log {
    padding:4px;
    border:dashed silver 1px;
    position:absolute;
    top:4px;
    right:4px;
    bottom:4px;
    overflow-y:auto;
    font-family:monospace;
    font-size:10px;
    }
    
.log div {
    border-bottom:dashed silver 1px;
    margin-bottom:4px;
    padding-bottom:4px;
    }