Problem mit Bild-Positionierung

[Paludis]

Ok, ich habe es nun soweit hingekriegt, dass es mir gefällt. Aber wie kriege i h genau den Footer nach unten?

*, *::before, *::after { box-sizing: border-box; }



body {
    background-image: linear-gradient(rgba(0, 0, 0, 0.3) 0, rgba(0, 0, 0, 0.3)), url('img/tape-measure.jpg');
    background-size: cover;
    min-height: 1500px;
    color: #000305;
    font-size: 100%;
    font-family: 'Coming Soon', 'Lucida Sans Unicode', cursive;
    line-height: 1.5;
}



.mainHeader {
    width: 90%;
    margin: 0 auto;
}



.mainHeader nav {
    background-color: #9cb34f;
    border-radius: 5px;
}

.mainHeader nav ul {
    list-style: none;
    margin: 2em;
    padding: 0;
    
}


nav:first-of-type ul {
    display: flex;
    flex-flow: row wrap;
}


nav:first-of-type li {
    flex: 1 0 15em;
    padding: 0.125em;
}


nav a {
    display: block;
    padding: 1em;
    text-decoration: inherit;
}


.mainHeader nav a:link, .mainHeader nav a:visited {
    color: #fff;
    
    
}

.mainHeader nav a:hover,
.mainHeader nav a.Home:link,
.mainHeader nav a.Home:visited {
  background-color: #CF5C3F;
  text-shadow: none;
}


.mainHeader nav ul li a {
    border-radius: 5px;
    
    
}



.mainHeader img.Margrit {
    width: 20%;
    position: absolute;
    right: 5%;
    top: 20%;
}


.mainHeader img.Logo {
    width: 20%;
    position: absolute;
    right: 5%;
    top: 78%;
}



.mainHeader p.inBearbeitung {
    position: absolute;
    top: 40%;
    left: 5%;
    font-size: 175%;
}



.mainFooter {
    width: 90%;
    border-radius: 5px;
    background-color: #9cb34f;
	display: table;
    margin: 0 auto;
}


.mainFooter p {
    
    color: #fff;
    display: table-cell;
    vertical-align: middle;
    padding-left: 1%;
}