* {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    align-items: center;
}

header {
    font-weight: 900;
    color: black;
    font-size: 50px;
    padding: 6vmin 0 4vmin 0;
    text-align: center;
    width: 100%;
}

body {
    margin-top: 15vh;
    text-align: center;
    align-items: center;
}
  
#board {
    display: inline-grid;
    grid-template-rows: 100px 100px 100px;
    grid-template-columns: 100px 100px 100px;
    grid-gap: 3px;
    background-color: black;
}

.box {
    height: 100px;
    width: 100px;
    background-color: white;
    color: black;
    font-size: 90px;
    font-weight: 900;
    border: none;
}

.box:hover {
    cursor: pointer;
}

#replay {
    width: 300px;
    font-size: 2vmin;
    font-weight: bold;
    padding: 2vmin;
    margin-top: 4vmin;
    border: none;
    background-color: white;
    color: black;
    outline: solid;
    outline-width: 3px;
    cursor: pointer;
}
  
#replay:hover {
    background-color:black;
    color: white;
}