style.css

* {
    border: 0;
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #344C64;
    color: #577B8D;
    font-family: "Courier New", sans-serif;
}

.title-card {
    margin: 50px 0;
}

.game-menu {
    display: flex;
    flex-direction: column;
    margin-bottom: 50px;
}

.game-menu-colors,
.game-menu-options {
    display: flex;
    justify-content: center;
}

.game-menu-options {
    margin-bottom: 36px;
    justify-content: space-evenly;
}

.game-menu-colors button,
.game-menu-options button {
    background-color: #57A6A1;
    padding: 1em;
    border-radius: 10px;
}

.game-menu-colors #random {
    margin: 0 64px;
}

.game-menu button:hover {
    background-color: #64e2da;
}

.game-board,
.game-area {
    width: 640px;
    height: 640px;    
}

.game-board {
    border: 5px solid black;
    margin-bottom: 128px;
}

.game-board .game-area {
    font-size: 0;
    display: flex;
    background-color: #FAF9F6;
}