* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #5c5c5c;
    font-family: 'Gill Sans', 'Trebuchet MS', sans-serif;
    display: flex;
    justify-content: center;
    padding: 20px;
    text-align: center;
}

.container {
    width: 100%;
    max-width: 900px;
}

h2 {
    color: white;
    border-bottom: 2px solid white;
    margin: 20px 0;
    padding-bottom: 10px;
}

.heading,
.result {
    background: #0f100c;
    color: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.insert {
    background: white;
    border-radius: 10px;
    padding: 20px;
}

table {
    width: 100%;
}

td,
th {
    padding: 10px;
    color: #0f100c;
}

input {
    width: 100%;
    height: 40px;
    padding: 8px;
    border: 2px solid #0091ff;
    border-radius: 5px;
}

button {
    padding: 10px 20px;
    background: #fc6b6b;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background: #58fec7;
}

#result_out {
    font-size: 28px;
    font-weight: bold;
}