*{
    box-sizing: border-box;
}


body{
    background-image: url("../img/pattern.gif") ;
}




h1{
    width: 100%;
    background-color: lightgrey;
    text-align:center;
    padding: 1px;
    border-bottom: 8px double black;
    height:80px;

}

.padre{
    width: 70%;
    margin:20px auto;
    padding: 16px;
    border: 2px solid red;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    background-color: darkslategray;
}



.uno{
    width: 32%;
    height: 220px;
    background-color: lightyellow;
    padding: 16px; 
    text-align: left;
   

}

.dos{
    width: 32%;
    height: 220px;
    background-color: lightblue;
    padding: 16px; 
    text-align: center;
   

}



.tres{
    width: 32%;
    height: 220px;
    background-color: pink;
    padding: 16px; 
    text-align: right;
   
}