style.css

html {
    height: 100%;
    --range-value: 100%;
    --canvas-color: rgb(180, 254, 235);
}

body{
    background-image: linear-gradient(160deg, #a50071, #4b588c, #5fa66a, #017070);
    background-attachment: fixed;
    color: #eee;
    text-align: center;
    font-family: "Andale Mono", monospace;
    display: flex;
    flex-direction: column;
    height: 100vh;
    margin: 0;
}

header {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    background: #111;
    opacity: .8;
    width: 100%;
    flex: 0 0 auto; 
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
}

.tool-labels {
    margin: 13px 0;
    font-size: 24px;
    color: #68ffd8;
}

footer {
    width: 100%;
    font-size: 16px;
    padding: 15px 0 10px;
    background-color: #111;
    opacity: .8;
    flex: 0 0 auto; 
}

a {
    color: #b4feeb;
}
a:hover {
    color: #68ffd8;
    text-decoration: none;
}

button, .container, .color-input, .knob-shadow, .range-slider {
    box-shadow: 1px 2px 10px 1px #555;
}

button, .container, .color-input, .knob {
    cursor: pointer;
    background-color: #f0fbf8;
    border: none;
    color: #000;
}
button:hover, .container:hover, .color-input:hover, 
.knob:hover, .knob:active, .is-active {
    background-color: #68ffd8;
}

button:active, .container:active, .color-input:active{
    background-color: #017070;
    color: #f0fbf8;
}

.pen-input, .grid-input {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    margin: 20px;
}

.pen-color, .pen-tools, .grid-tools, 
.col-picker, .background-col-picker {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.col-picker, .background-col-picker {
    margin: 5px;
    width: 100px;
    padding: 0 10px;
}

.sub-labels {
    padding-bottom: 5px;
    font-size: 18px;
    color: #f0fbf8;
}
.trans.sub-labels {
    display: flex;
    flex-direction: column;
}

.color-input {
    width: 120%;
    height: 25px;
}

button {
    display: block;
    width: 120px;
    height: 25px;
    margin: 5px;
    font-size: 18px;
}

.container{
    border: 1px solid #bbb;
    height: 500px;
    width: 100%;
    max-width: 500px;
    margin: 20px;
    display: flex;
    flex-wrap: wrap;
    background: rgb(180, 254, 235);
}

.grid {
    box-sizing: border-box;
}

.grid-on {
    border: 1px solid #bbb;
}

.grid-off {
    border: none;
}

.slider {
    display: flex;
    flex-direction: column;
    margin: 0 10px;
    align-items: center;
    font-size: 18px;
}

.range-slider {
    appearance: none;
    width: 100%;
    height: 12px;
    background: rgb(180, 254, 235);
    border-radius: 6px;
    margin-bottom: 20px;
}
.range-slider:hover {
    box-shadow: 1px 2px 10px 1px #68ffd8;
}
.range-slider:active {
    box-shadow: 1px 2px 10px 1px #68ffd8;
}

input[type="range"]::-moz-range-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 6px;
    background: #f0fbf8;
    cursor: pointer;
    box-shadow: 1px 2px 10px 1px #555;
}
input[type="range"]::-moz-range-thumb:hover {
    background-color: #68ffd8;
}
input[type="range"]::-moz-range-thumb:active{
    background-color: #68ffd8;
}
input[type="range"]::-moz-range-track {
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(to right, var(--canvas-color) 0%, var(--canvas-color) var(--range-value), #bbb var(--range-value), #bbb 100%);
}


input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 6px;
    background: #f0fbf8;
    cursor: pointer;
    transform: translateY(-15%);
    box-shadow: 1px 2px 10px 1px #555;
}
input[type="range"]::-webkit-slider-thumb:hover {
    background-color: #68ffd8;
}
input[type="range"]::-webkit-slider-thumb:active {
    background-color: #68ffd8;
}
input[type="range"]::-webkit-slider-runnable-track {
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(to right, var(--canvas-color) 0%, var(--canvas-color) var(--range-value), #bbb var(--range-value), #bbb 100%);;
}

#gridSlider {
    display: none;
}

.knob-container {
    position: relative;    
}

.knob-shadow {
    width: 95px;
    height: 95px;
    border-radius: 50%;
    position: absolute;
    top: 5%;
    left: 1%;
    z-index: -1;
}

.knob {
    width: 95px;
    height: 95px;
    border-radius: 50%;
    margin-top: 5px;
    position: relative;
    z-index: 1;
}
.knob:hover {
    box-shadow: 1px 2px 10px 1px #68ffd8;
}
.knob:active {
    box-shadow: 1px 2px 10px 1px #68ffd8;
}

.knotch {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    cursor: pointer;
    background: #111;
    position: relative;
    top: 15%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.knobless-grid-tools {
    display: block;
}

.grid-buttons {
    display: flex;
    flex-direction: column;
}

@media screen and (max-width: 900px) {
    header {
        font-size: 20px;
    }

    main {
        flex-direction: column;
    }
    
    .pen-color, .pen-tools, .grid-tools {
      flex-direction: row; /* Switch to a row layout when wrapping occurs */
      align-items: flex-end;
      justify-content: center;
      flex-wrap: wrap;
    }

    #h3-pen-color{
        margin-bottom: -13px;
    }

    .sub-labels {
        display: flex;
        flex-direction: column;
    }
    .trans.sub-labels {
        display: block;
    }
}
 
@media screen and (max-width: 559px) {
    #h3-pen-color {
        margin: 13px 0;
    }
}