*{
    box-sizing: border-box;
}

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

#contenedor{
    width: 90%;
    height: 450px;
    margin: 20px auto;
    background-color: grey;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 10px;
}

#titulo{
    width: 100%;
    height: 100px;
    background-color: lightgray;
}

#bloque1{
    width: 32%;
    height: 230px;
    background-color: peru;
    padding: 10%;
    text-align: left;
}

#bloque2{
    width: 32%;
    height: 230px;
    background-color: pink;
    padding: 10%;
    text-align: center;
}

#bloque3{
    width: 32%;
    height: 230px;
    background-color: powderblue;
    padding: 10%;
    text-align: right;
}