:root {
    /* DEFINIENDO VARIABLES */
    --blanco: #ffffff;
    --negro: #141414;
}

* {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body{
    width: 80%;
}

table{
    border: 3px solid black;
}

table input{
    height: 50px;
    width: 50px;
}

table p{
    height: 50px;
    width: 50px;
    margin: 0px;
    text-align: center;
}

td{
    height: 50px;
    width: 50px;
    border: 1px solid black;
}

.marcadov{
    border-right: 3px solid black;
}

.marcadoh{
    border-bottom: 3px solid black;
}