body {
    color: grey;
    background: black;
    font-family: arial;
}

div.center {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    border: dotted black;
    padding: 20px;
    margin: 25px;
}

div.header {
    width: 100%;
    position: relative;
    top: 1px;
    display: flex;
    justify-content: center;
    align-items: center;
}

div.menu {
    width: 100%;
    height: 15px;
    position: relative;
    top: 1px;
    display: flex;
    justify-content: center;
    align-items: center;
}

div.content {
    width: 100%;
    height: 90%;
    display: flex;
    justify-content: center;
    align-items: center;
    border: solid grey;
}

div.footer{
    width: 100%;
    height: 15px;
    position: relative;
    bottom: 1px;
    display: flex;
    justify-content: center;
    align-items: center;
}