style.css

body {
    font-family: "Lato", sans-serif; 
    background-color: #222;
    text-align: left;
}

/* unvisited link */
a:link {
    color: #777;
}

/* visited link */
a:visited {
    color: #444;
}

/* mouse over link */
a:hover {
    color: #ccc;
}

/* selected link */
a:active {
    color: #333;
}

.text-color {
    color: #ccc;
    text-align: center;
}
.text-color-light {
    color: #999;
    text-align: center;
}

.cb-container {
    text-align: center;
}

.cb-div {
    display: inline-block;
    text-align: center;
    margin: auto;
}

label {
    color: #ccc;
    text-align: left;
}

.output {
    text-align: center;
    color: #ccc;
}

.container {
    margin: auto;
}

input {
    background-color: #2f2f2f;
    color: #ccc;
    padding: 10px 10px;
    margin: 5px 0px;
    box-sizing: border-box;
    border: 1px solid #444;
    border-radius: 2px;
    width: 100%;
}
input:hover {
    background-color: #383838;
}

.button {
    background-color: #2f2f2f;
    color: #ccc;
    text-align: center;
    padding: 10px 70px;
    border: 1px solid #444;
    margin: auto;
    margin-top: 10px;
    margin-bottom: 5px;
}
.button:disabled {
    color: #777;
    background-color: #282828;
}
.button:hover:enabled {
    background-color: #383838;
}