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

html, body {
    height: 100%;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: 'Courier New', Courier, monospace;
    background-image: linear-gradient(rgba(255, 255, 255, 0.45), rgba(255, 255, 255, 0.45)), url('/img/oxy.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

header {
    text-align: center;
    text-transform: uppercase;
    font-size: 38px;
    letter-spacing: 4px;
    color: black;
    font-weight: 800;
    padding: 30px 20px 10px;
}

hr {
    border: none;
    border-top: 1px solid rgba(0, 0, 0, 0.4);
    width: 60%;
    margin: 0 auto;
}

.container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    margin-bottom: auto;
}

table {
    border-collapse: separate;
    border-spacing: 20px;
    font-size: 18px;
}

table tr td {
    padding: 20px 40px;
    text-align: center;
    background-color: rgba(255, 255, 255, 0.6);
    border: solid 1px rgba(0, 0, 0, 0.795);
    border-radius: 10px;
    box-shadow: inset 0 0 7px rgba(0, 0, 0, 0.8);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

table tr td:hover {
    box-shadow: inset 0 0 5px rgba(29, 0, 0, 0.581);
    border: solid 1px rgb(255, 0, 0);
    font-weight: bold;
    background-color: rgba(165, 42, 42, 0.278);
}

table tr td a {
    color: black;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

footer {
    text-align: center;
    padding: 15px;
    font-size: 14px;
    color: black;
    margin-bottom: 10px;
}