style.css

body{
    background-color: #FDF5E6;
}
.container{
    align-content: center;
    width: 50%;
    margin: auto;
    padding: 10px;
}

.grid{
    height: 400px;
    width: 400px;
    flex-wrap: wrap;
    display: flex;
    background-color: #FFDAB9;
    border: 10px solid #FFDAB9;
    margin: auto;
    margin-bottom: 20px;
}

h3{
    font-family: 'Robiti Mono', monospace;
}

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

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

.checked{
    height: 40px;
    width: 40px;
    border: 2px solid;
    background-color: #cecab7;
    border-color: #9c998d;
    box-sizing: border-box;
}

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

.one{
    color: #e76346;
}
  
.two{
    color: #4199d3;
}
  
.three{
    color: #57da59;
}
  
.four{
    color: #bb41d3;
}
  
#result{
    margin-top: 5px;
    color: #e76346;
}

.button {
    margin-top: 15px;
    font-size: 15px;
    background-color: #f0c14b;
    height: 30px;
    width: 150px;
    cursor: pointer;
    border: none;
    font-family: 'Robiti Mono', monospace;
}