body {
     margin: 0;
     /*overflow: hidden;*/
     color: black;
     text-align: center;
     background-color: lightblue;
     font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', 'Geneva', Verdana, sans-serif;
     }
     
     h1 {
     
     position: relative;
     width: 100%;
     z-index: 1;
     font-size: 1.5rem;
     }
     
     p {
          width: 100%;
          position: relative;         
          text-align: center;
     }

     a {
     color: white;
     }
     a:hover{
     color: purple;
     }
     
     /* varios Id */

     .variosId {
          color: black;
     }
     
     /* unico Id */

     #myCanvas {
          border: 1px solid black;
       /*   width: 400px;
          height: 200px; */
          position: relative;
                  
     }

     
     #operacoesA {
          color: red;
          font-size: 0.8rem;
     }