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

#contenedor{
    width: 900px;
    height: 250px;
    background-color: gray;
    padding: 15px;
    font-size: large;
    border: 2px solid black;
}

#titulo{
    width: 900px;
    height: 50px;
    text-align: center;
    background-color: lightgray;
    margin-bottom: 15px;
    border-bottom: 5px double black;
    font-size: xx-large;
}

#bloque1{
    width: 290px;
    height: 100px;
    background-color: lightcoral;
    float: left;
    padding: 10px;
    box-sizing: border-box;
    text-align: left;
}

#bloque2{
    width: 290px;
    height: 100px;
    background-color: rgb(49, 178, 32);
    float: left;
    padding: 10px;
    box-sizing: border-box;
    margin-left: 5px;
    margin-right: 5px;
    text-align: center;
}

#bloque3{
    width: 290px;
    height: 100px;
    background-color: lightblue;
    float: left;
    padding: 10px;
    box-sizing: border-box;
    text-align: right;
}