style.css

.container {
    max-width: 500px;
    margin: 0 auto;
}

.grid {
    height: 400px;
    width: 400px;
    display: flex;
    flex-wrap: wrap;
    background-color: rgb(220, 214, 188);
    margin-left: 50px;
    margin-top: 20px;
    border: 10px solid rgb(220, 214, 188);
    margin-bottom: 10px;
}

div {
    font-size: 25px;
    text-align: center;
    font-family: "Roboto Mono", monospace;
}

.valid, .bomb {
    width: 40px;
    height: 40px;
    border: 5px solid;
    border-color: #f5f3eb #bab7a9 #bab7a9 #fff9db;  
    box-sizing: border-box;
}

.checked {
    width: 40px;
    height: 40px;
    border: 2px solid #9c998d;
    box-sizing: border-box;
}

.one {
    color: #e76346;
    border: 2px solid #9c998d;
}

.two {
    color: #4199d3;
    border: 2px solid #9c998d;
}

.three {
    color: #57da59;
    border: 2px solid #9c998d;
}

.four {
    color: #bb41d3;
    border: 2px solid #9c998d;
}

.flag {
    color: #ff0000; /* Red flag */
    font-size: 30px;
}