h1 {font-size: 1.5em;
    width: 100%;}
h3 {width: 100%;}
#crono { font-size: 100px;}
#start {width: 15%;
	    min-width: 100px;
	    margin-top: 30px;
        height: 100px;
        margin-right: 0px;
        margin-left: 30px;
        position: absolute;
	    left: 0%;
	    top: 70%;
    }
#central {width: 50%;
	      height: 120px;
	      display: block;
          padding-top: 10px;
          margin-left: 0px;
          position: absolute;
	      left: 25%;
	      top: 20%;}
#reset {width: 15%;
	    min-width: 100px;
	    margin-top: 30px;
        height: 100px;
        margin-right: 30px;
        margin-left: 0px;
        position: absolute;
	    left: 55%;
	    top: 70%;}
#marcas {width: 100%;}
.botones {margin-top: 37px;}