*{
    box-sizing: border-box;
}

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

}

#contenedor{
    width: 90%;
    height: 400;
    margin: 20px auto;
    background-color: grey;
    display: flex;
    flex-wrap: wrap;
    padding: 10px;
    justify-content: space-between;
    border: 5px solid;
}

#titulo{
    width: 100%;
    height: 100;
    margin: 20px auto;
    font-size: 250%;
    text-align: center;
    background-color: lightgray;
    padding: 25px;
    border-bottom: 15px double black;
}

#bloque1{
    width: 32%;
    height: 200px;
    text-align: left;
    background-color: lightyellow;
    padding: 20px;
    margin-bottom: 200px;
}

#bloque2{
    width: 32%;
    height: 200px;
    text-align: center;
    background-color: plum;
    padding: 20px;
    margin-bottom: 200px;
}

#bloque3{
    width: 32%;
    height: 200px;
    text-align: right;
    background-color: lightpink;
    padding: 20px;
    margin-bottom: 200px;
}