.blog {
    text-align: left;
    margin-left: auto;
    margin-right: auto;
    border: #000000 1px solid;
    padding:10px;
    width: 45%;
    background-color: MediumBlue;
    height: 600px;
    color: white;
}

body {
    background-color: #222;;
}

header {
    height: 80px;
    font-size: 30px;
    box-sizing: border-box;
    color: white;
    background-color: mediumblue;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    width: 46.4%;
}