*{
    box-sizing: border-box;
}
body{
    background-image: url(../img/pattern.gif);
}
#contenedor{
width: 100%;
height: 600px;
margin: 20px auto;
background-color: grey;
flex-wrap: wrap;
display: flex   ;
justify-content: space-between;
padding: 10px;
border: 5px solid;
}
#titulo{
    width: 100%;
    text-align: center;
    background-color: rgb(192,192,192) ;
    height: 100px;
    font-size: 50px;
    padding: 20px;
    border-bottom: 10px double;
}

#bloque1{
    width: 32.5%;
    text-align: left;
    background-color: yellow ;
    height: 150px;  
    font-size: 20px;
    margin-left: 5px;
    padding: 10px;
}
#bloque2{
    width: 32.5%;
    text-align: center;
    background-color: purple ;
    height: 150px;
    font-size: 20px;
    padding: 10px;
    
}
#bloque3{
    width: 32.5%;
    padding: 10px;
    margin-right: 10px;
    margin-bottom: 15%;
    text-align: right;
    background-color: pink ;
    height: 150px;
    font-size: 20px;
}