style.css

body{
    margin: 0px;
    width: 100%;
    height: 100%;
}

header{
    display: flex;
    width: 100%;
    height: 23vh;
    background-color:rgb(9, 255, 0);
    justify-content:space-evenly;
    align-items:center;
    }
.cuadradoArriba{
    background-color:rgb(255, 174, 212);
    width: 150px;
    height: 150px;
}
.rectangulitoArriba{
    background-color: darkblue;
    margin-top: 40px;
    height: 15px;
    width: 150px;
}
footer{
    display: flex;
    width: 100%;
    height: 15vh;
    background-color: rgb(255, 57, 123);
    justify-content: space-evenly;
    align-items: center;

}
h2{
    background-color: blueviolet;
    color: rgb(110, 220, 20);

}
.textoUno{
    margin-left: 30vw;
}

footer > h2 {
    margin-left: 30vw;
}

section{
   background-color: darkred;
    height: 150px;
    width: 150px;    
}
.uno{
    background-color: deepskyblue;
    height: 30px;
    width: 150px;
}