*{
    box-sizing:border-box;
}


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

#contenedor{
    width: 80%;
    height: 888px;
    background-color: gray;
    border: 5px solid black;
    margin: 20px auto;
    display: flex;
    flex-wrap: wrap;
}

#titulo{
    width: 90%;
    height: 250px;
    background-color: lightgrey;
    margin: 20px auto;
    border-bottom: 12px double black;
    text-align: center;
    font-size: 4em;
    padding-top: 30px;
}  

#bloque1{
    width: 30%;
    height: 250px;
    background-color: lightyellow;
    margin: 20px auto;
    padding-top: 20px;
    font-size: 2em;
    text-align: left;

}

#bloque2{
    width: 30%;
    height: 250px;
    background-color: lightblue;
    margin: 20px auto;
    font-size: 2em;
    text-align: center;

}


#bloque3{
    width: 30%;
    height: 250px;
    background-color: lightpink;
    margin: 20px auto;
    font-size: 2em;
    text-align: right;
}

#bloque4{
    width: 30%;
    height: 250px;
    background-color: lightpink;
    margin: 20px auto;
    font-size: 2em;
    text-align: right;
}