* {
    box-sizing: border-box;
    font-family: 'Courier New', Courier, monospace;
}
body {
    margin: 0;
    padding: 0 8px;
}
#add-panel, #compute-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #00000088;
    display: none;
    align-items: center;
    justify-content: center;
}
#compute-panel > div > p {
    margin: 0;
}
button {
    background-color: black;
    color: white;
    padding: 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}
button:hover {
    background-color: #000000CC;
}
h1 {
    margin: 0;
}
button {
    margin: 8px 0;
}
table, th, td {
    border: solid black 1px;
}
th, td {
    padding: 8px;
    text-align: center;
}
.price {
    text-align: end;
}