h1{
    text-align: center
}



 table#tableau_exo_6
            {
                border-collapse: collapse;                
            }
            th
            {
                width:6cm;
                height:0.5cm;
                border: 2px white solid;
                background-color: pink;
                text-align: left;
            }
            td
            {
                width:6cm;
                height:0.5cm;
                border: 2px white solid;
                background-color: silver;
            }
          


body{
    background-color: #FFFAFA ;

}