header {
    margin: -10px;
    background-color: #22dd89cf;
    padding: 5px;
    border-bottom: 2px solid black;
    font-family: Arial;
    font-size: 50; }
header h1 {margin: 0px; font-size: 65px; font-family: Arial; text-decoration: underline; padding: 10px;}
header h2 {margin: 0px; font-size: 60px; font-family: Arial; font-weight: lighter; padding: 10px;}
header h3 {margin: 0px; font-size: 55px; font-family: Arial; font-weight: bold; padding: 10px;}
body {margin: 0px; font-size: 50px; font-family: Arial; font-weight: lighter; padding: 10px;}
nav {margin: 0px; font-size: 42px; font-family: Arial; font-weight: lighter; padding: 10px;}
button {margin: 0px; width: 20%; height: 75px; height: 75px; font-size: 45px; font-family: Arial; font-weight: lighter; color: black; background-color: #22dd89cf;  border-color: black; padding: 10px;}
select {margin: 0px; font-size: 45px; font-family: Arial; font-weight: lighter; border-color: black; padding: 10px;}
.style_1 {margin: 0px; width: 60%; height: 75px; font-size: 45px; font-family: Arial; font-weight: lighter;  border-color: black; background-color: white; box-sizing: border-box; padding: 10px;}
.style_1:invalid {color: #ACACAC; /* Placeholder-Grau */}
.style_1 option {margin: 0px; font-size: 20px; font-family: Arial; font-weight: lighter; padding: 10px;}