h1 {
    text-align: center;
    padding: 5px;
}

h2 {
    text-align: center;
}

li {
    font-size: 18px;
}

body {
    font-family: Arial, sans-serif;
}

.centre {
    display: flex;
    justify-content: center;
}

.container {
    width: 900px;
    display: grid;
    padding: 20px;
    grid-template-columns: repeat(3, 1fr);
}

.item {
    width: 300px;
    height: 150px;
    padding: 10px;
    border-style: solid;
    border-width: 1px;
    font-family: Arial, sans-serif;
}

button {
    background-color: white;
    width: 300px;
    height: 150px;
    padding: 10px;
    margin: 0;
    border-style: solid;
    border-color: #111111;
    border-width: 1px;
    font-size: 18px;
    font-family: Arial, sans-serif;
}

button:visited {
    background-color: darkred;
}

button:hover {
    transition: 500ms;
    background: darkgray;
}

.clicked {
    background-color: darkred;
    color: white;
}