body {
    background-color: black;
    color: lime;
    font-family: "Courier New", monospace;
    margin: 0;
    padding: 0;
}

#container {
    width: 600px;
    margin: 20px auto;
    background-color: #111;
    border: 2px solid lime;
    overflow: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    text-align: center;
}

p {
    font-size: 16px;
    text-align: center;
}

.box {
    border: 2px dashed lime;
    padding: 10px;
    margin: 15px 0;
}

marquee {
    font-size: 16px;
}

img {
    display: block;
    margin: 10px auto;
}

.footer {
    text-align: center;
    font-size: 12px;
}

#info {
    width: 580px;
    height: 150px;
    overflow: auto;
    border: 1px solid lime;
    padding: 10px;
    margin: 10px auto;
    background-color: #222;
    color: lime;
    font-family: "Courier New", monospace;
    font-size: 14px;
    white-space: normal;
}

#navbar {
    background-color: #222;
    border: 1px solid lime;
    padding: 5px;
    overflow: hidden;
    width: 600px;
    margin: 0 auto 20px auto;
}

#navbar ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    white-space: nowrap;
}

#navbar ul li {
    display: inline;
    margin-right: 20px;
}

#navbar ul li a {
    color: lime;
    text-decoration: none;
    font-weight: bold;
}

#navbar ul li a:hover {
    text-decoration: underline;
}

/* Calculator */
#display {
    width: 260px;
    height: 30px;
    font-size: 18px;
    margin-bottom: 10px;
    background-color: #222;
    color: lime;
    border: 1px solid lime;
    text-align: right;
    padding-right: 5px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

input[type="button"] {
    width: 60px;
    height: 40px;
    margin: 4px;
    font-size: 18px;
    background-color: #111;
    color: lime;
    border: 1px solid lime;
    cursor: pointer;
}

input[type="button"]:hover {
    background-color: lime;
    color: black;
}

#containerCalc {
    width: 600px;
    margin: 20px auto;
    background-color: #111;
    border: 2px solid lime;
    overflow: hidden;
}

#containerCalc .numbers {
    text-align: center;
}