body {
    background-color: black;
}

img {
    height: 50px;
    margin-bottom: 50px;
}

.main {
    position: relative;
    height: 300px;
    width: 300px;
    border: solid;
    background-color: black;
    border-color: white;
}

.rules h3 {
    font-family: Arial, Helvetica, sans-serif;
    border: solid;
    display: inline-block;
    margin: 5px;
    padding: 5px;
    border-radius: 5px;
}

.A {
    height: 100px;
    width: 100px;
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: auto;
    justify-content: center;
    align-items: center;
    display: flex;
    font-family: Arial, Helvetica, sans-serif;
}
.E {
    height: 100px;
    width: 100px;
    position: absolute;
    top: 0;
    right: 0;
    pointer-events: auto;
    justify-content: center;
    align-items: center;
    display: flex;
    font-family: Arial, Helvetica, sans-serif;
}
.I {
    height: 100px;
    width: 100px;
    position: absolute;
    bottom: 0;
    left: 0;
    pointer-events: auto;
    justify-content: center;
    align-items: center;
    display: flex;
    font-family: Arial, Helvetica, sans-serif;
}
.O {
    height: 100px;
    width: 100px;
    position: absolute;
    bottom: 0;
    right: 0;
    pointer-events: auto;
    justify-content: center;
    align-items: center;
    display: flex;
    font-family: Arial, Helvetica, sans-serif;
}

.popup {
    position: absolute;
    display: block;
    z-index: 0;
    background-color: blueviolet;
    display: none;
}

.popup button {
    cursor: pointer;
}

.corner {
    background-color: white;
    font-size: 50px;
    margin: 10px;
    border-radius: 10px;
}