style.css

@import url('https://fonts.googleapis.com/css2?family=Odibee+Sans&family=Poppins&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Odibee+Sans&family=Poppins&family=Signika+Negative&display=swap');

body {
    margin: 0;
    padding: 0;
    background-color: #c97076;
    font-family: 'Poppins', sans-serif;
}

h1 {
    text-align: center;
    font-size: 4em;
    font-family: 'Signika Negative', sans-serif;
}

main {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    justify-items: center;
}

.toggle-grp {
    margin-bottom: 25px;
    display: flex;
    align-items: center;
}
.toggle {
    width: 25px;
    height: 25px;
    background-color: hsl(0, 11%, 75%);
    margin-right: 10px;
    border-radius: 50%;
}

#sketch-cntnr {
    display: grid;
    width: 512px;
    height: 512px;
    grid-template-columns: repeat(16, 1fr);
    border: 1px solid black;
}
#sketch-cntnr > * {
    background-color: hsl(0, 0%, 100%);
}
.display-on {
    background-color: black;
}

.toggle-on {
    border-style: inset;
}

#grid-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 200px;
    height: 8px;
    background: hsl(0, 0%, 18%);
    border-radius: 25px;
    border: 1px solid black;
    box-shadow: 0px 2px 3px hsl(0, 0%, 22%);
}
#grid-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 30px;
    border-radius: 25px;
    background-color: hsl(0, 11%, 75%);
}
#grid-slider::-moz-range-thumb {
    width: 10px;
    height: 30px;
    border-radius: 25px;
    background-color: hsl(0, 11%, 75%);
}
#grid-size {
    border: 1px solid black;
    background-color:#7a8570;
    padding: 3px;
    box-sizing: border-box;
}

#color-selection-cntnr {
    display: flex;
    justify-content: space-around;
    margin-top: 75px;
}
.toggle-grp-color {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.toggle-grp-color button {
    margin-right: 0;
    margin-bottom: 10px;
}