pruebaestilos.css

.container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(7, 1fr);
    grid-column-gap: 3rem;
    grid-row-gap: 3rem;
}

.header {
    position: relative;
    background: #ff8000;
    background: url(./img/headerEdit.png);
    background-repeat: no-repeat;
    background-position-x: 400px;
    background-size: 100% 100%;
    grid-column-gap: 3rem;
    grid-column-start: 1;
    grid-column-end: 3;
    grid-row-start: 1;
    grid-row-end: 1;
    height: 600px;
    width: 1900px;
}

.logo {
    /*background: #43A047;*/
    height: 500px;
    width: 500px;
    grid-column-start: 1;
    grid-column-end: 2;
    grid-row-start: 1;
    grid-row-end: 2;
    position: relative;
}

.img-navegacion {
    height: 500px;
}

.Titulo {
    /*background: #888;*/
    grid-column-start: 2;
    grid-column-end: 3;
    grid-row-start: 2;
    grid-row-end: 3;
    width: 50%;
    position: relative;
    left: 500px;
    right: 0px;
    top: -300px;
    bottom: 0px;
}

.Titulo h1 {
    font-size: 60px;
    font-family: Arial, Helvetica, sans-serif;
}

.Titulo h2 {
    font-size: 60px;
    font-family: Arial, Helvetica, sans-serif;
    position: relative;
    right: -100px;
}

.navegacion {
    background: #1d4698;
    grid-column-gap: 1px;
    grid-column-start: 2;
    grid-row-end: 1;
    width: 60%;
    position: relative;
    left: 500px;
    right: 0px;
    top: -750px;
    bottom: -800px;
}

.navegacion li {
    float: right;
    list-style: none;
    padding: 40px;
}

.navegacion li a {
    text-decoration: none;
    border: 1px solid blue;
    border-radius: 10px;
    font-family: Arial, Helvetica, sans-serif;
    z-index: 1;
}

.Articulo1 {
    background: #1d4698;
    grid-column-start: 1;
    grid-row-end: 3;
    grid-column-start: 1;
    grid-column-end: 3;
    grid-row-start: 3;
    grid-row-end: 3;
}

.Articulo2 {
    background: #4d73bf;
    grid-column-start: 1;
    grid-column-end: 3;
    grid-row-start: 4;
    grid-row-end: 4;
}

.secciones {
    background: #373737;
    grid-column-start: 1;
    grid-column-end: 3;
    grid-row-start: 5;
    grid-row-end: 6;
}

.footer {
    background: #373737;
    grid-column-start: 1;
    grid-column-end: 3;
    grid-row-start: 7;
    grid-row-end: 7;
}