html {
    display: table;
    margin: auto;
}

body {
    display: table-cell;
    vertical-align: middle;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}
#output {
    width: 450px;
    height: 300px;
    overflow-y: auto;
    border: 4px solid black;
    border-radius: 8px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19)
}

form {
    display: inline;
}

button, input {
    border-radius: 8px;
}

h1 {
    text-align: center;
}

#controls {
    display: flex;
    justify-content: space-evenly;
}

.victory {
    font-size: 1.5em;
}