style.css

*{
    font-family:'Courier New', Courier, monospace;
}
body{
    background-color: khaki;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    margin-top: -10px;
}
#heading{
    display: flex;
    justify-content: center;
    align-items: center;
}
#choice{
    margin-top: -15px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.sliderprompt{
    padding: 5px;
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
}
#black,#rgb,#reset{
    width:80px;
    margin: 5px;
    background-color: blanchedalmond;
    box-shadow: 3px 3px 8px black;
}
.color-prompt{
    margin:7.5px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
#color{
    margin-top: 30px;
    margin-bottom: -20px;
    height:20px;
}
#txt{
    margin-top: 25px;
    color: crimson;
    font-size: 10px;
}
.grid{
    margin-top: 10px;
    display: inline-grid;
    grid-template-columns: repeat(16, 2fr);
    grid-template-rows: repeat(16, 2fr);
    border: 5px solid white;
    border-radius: 5px;
    height: 425px;
    width: 425px;
    background-color: gray;
    box-shadow: 10px 10px;
}

.cell{
    background-color: white;
    border: 1px solid black;
}