main.css

* {
    --var-primary-color: white;
    --var-secondary-color: tomato;
    --var-primary-background-color: #444;
    --var-secondary-background-color: #333;
    --var-tertiary-background-color: #555;
}

html {
    font-family: Helvetica;
    display: inline-block;
    margin: 0px auto;
    text-align: center;
    line-height: 20px;
    background-color: var(--var-primary-background-color);
    color: var(--var-secondary-color) /*#eee*/;
}

div.container {
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
}

div.top {
    height: 60px;
    line-height: 60px;
    border-bottom: 1px dashed var(--var-primary-color);
    box-sizing: border-box;
}

div.top h1 {
    margin: 0;
}

div.top h1 a {
    color: var(--var-primary-color);
    text-decoration: none;
}

div.top h1 a:hover {
    text-decoration: underline;
}

div.content {
    text-align: center;
    width: 100%;
    max-width: 600px;
    padding: 20px 0px;
}

div.menu {
    text-align: center;
    width: 100%;
    max-width: 600px;
    min-width: 300px;
}

div.values {
    font-size: 120%;
    font-weight: bold;
    line-height: 130%;
}

div.wrapper {
    background-color: var(--var-secondary-background-color);
    margin: 0px auto;
    max-width: 600px;
    height: calc(100vh - 60px);
}

div.messageWindow {
    position: absolute;
    width: 300px;
    height: 50px;
    top: 5px;
    left: calc(50% - 150px);
    padding: 10px;
    font-size: 16px;
    line-height: 30px;
    /*background-color: #666;
    border: 1px solid black;*/
    box-sizing: border-box;
    opacity: 0;
    text-align: center;
    font-weight: bold;
    border-radius: 3px;
    /*color: var(--var-primary-color);*/
    transition: opacity 1s;

    background-color: var(--var-secondary-background-color);
    border: 1px solid var(--var-secondary-color);
}

div.temporaryMessage {
    background: var(--var-secondary-background-color);
    border: 1px solid var(--var-secondary-color);
    border-radius: 3px;
    left: 3%;
    max-width: 300px;
    padding: 10px;
    position: absolute;
    top: 80px;
}

ul.nav li.heading {
    background-color: var(--var-primary-background-color);
    border: 0px;
    /*border-top: 1px solid #666;
    border-bottom: 1px solid #666;*/
    color: var(--var-primary-color);
    font-weight: bold;
    font-size: 120%;
    padding: 12px 16px;
    text-transform: uppercase;
}
ul.nav li.heading a:hover {
    text-decoration: underline;
}

ul.nav {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 100%;
    box-sizing: border-box;
    background-color: var(--var-secondary-background-color);
    color: var(--var-secondary-color);
    border: 0px solid var(--var-secondary-background-color);
    border-radius: 4px;
}

ul.nav li {
    font-size: 14px;
    line-height: 17px;
    padding: 8px 16px;
}

ul.nav li a {
    text-decoration: none;
    color: var(--var-secondary-color);
}

ul.nav li:hover {
    background-color: var(--var-primary-background-color);
}

ul.nav li:hover a {
    color: var(--var-secondary-color);
}

ul.nav input {
    text-align: center;
}


input {
    background: inherit;
    border: 1px solid var(--var-tertiary-background-color);
    color: inherit;
    font: inherit;
    line-height: inherit;
    margin-left
}

input.link {
    cursor: pointer;
}

.bold {
    font-weight: bold;
}

.fade {
    opacity: 1;
    transition: opacity 0.1s;
}

.fade-out {
    opacity: 0.7;
}

.padding-10 {
    padding: 10px;
}

.color-secondary {
    color: var(--var-secondary-color);
}