button {
    width: 200px;
    height: 50px;
    display: block;
    margin: 30px auto;
    font-family: monospace;
    font-size: 1.5rem;
    cursor: pointer;
}

button:hover {
    box-shadow: 0px 0px 30px 2px grey;
}

#block {
    padding: 50px;
    width: 100px;
    height: 100px;
    background-color: blueviolet;
    border-radius: 50%;
    margin: 100px auto;
}

#square {
    width: 100px;
    height: 100px;
    background-color: aliceblue;
}

#rectangle {
    width: 100px;
    height: 50px;
    margin-top: 25px;
    background-color: aliceblue;
}

#circle {
    width: 100px;
    height: 100px;
    background-color: aliceblue;
    border-radius: 50%
}

#oval {
    width: 100px;
    height: 50px;
    margin-top: 25px;
    background-color: aliceblue;
    border-radius: 100px / 50px;
}

#triangle-up {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid aliceblue;
}

#triangle-down {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 100px solid aliceblue;
}

#triangle-topleft {
    width: 0;
    height: 0;
    border-top: 100px solid aliceblue;
    border-right: 100px solid transparent;
}

#triangle-bottomleft {
    width: 0;
    height: 0;
    border-bottom: 100px solid aliceblue;
    border-right: 100px solid transparent;
}

#triangle-bottomright {
    width: 0;
    height: 0;
    border-bottom: 100px solid aliceblue;
    border-left: 100px solid transparent;
}

#triangle-right {
    width: 0;
    height: 0;
    border-top: 50px solid transparent;
    border-left: 100px solid aliceblue;
    border-bottom: 50px solid transparent;
}
