body {
    background-color: aqua;
    color: black;
    font-family:'Courier New', Courier, monospace;
    text-align: center;
}

a {
    color:dimgray;
    text-align: center;

}

button {
    background-color: rgb(255, 251, 0);
    color: rgb(0, 0, 0);
    border: none;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

.h1 {
    font-size: 36px;
    margin-bottom: 20px;
}

mark {
    background-color: yellow;
    color: black;
    padding: 0 5px;
}