html {
    min-height: 100%;
    margin: 0;
    padding: 0;
}

body {
    color: #fff;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 18px; 
    text-shadow: 1px 0 0 #000, 0 -1px 0 #000, 0 1px 0 #000, -1px 0 0 #000;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#header { top: 0; }

#main { bottom: 0; }

.content {
    position: fixed;
    width: 100%;
    text-align: center;
    margin: 0 auto;
    min-height: 100px;
    padding: 0;
    background-color: rgba(0,0,0,0.5);
}

.content-container {
    text-align: left;
    margin: 0 auto;
    padding: 10px 0;
    width: 60%;
}

#header-content > h1 {
    font-size: 48px;
}

#content-message > h1 {
    position: absolute; 
    top: 40%;
}

.content-container > h1 {
    font-family: inherit;
    font-size: inherit;
    margin: 0;
    padding: 0;
}

#header-content > p {
    font-family: inherit;
    font-size: inherit;
    padding: 0;
    margin: 0;
}

#content-form > form > input[type=text] {
    font-family: inherit;
    font-size: inherit;
    flex: 2;
    margin: 10px 0 0 0;
    padding: 10px;
    border: 0;
    box-shadow: 0 0 15px 4px rgba(0,0,0,0.06);
}

#content-form > form > input[type=submit] {
    font-family: inherit;
    font-size: inherit;
    margin: 10px 0 0 0;
    padding: 10px;
    height: 97%;
    border: 0;
    box-shadow: 0 0 15px 4px rgba(0,0,0,0.06);
}

form {
    display: flex;
    align-items: center;
    width: 99%;
}