styles.css

h1, h2, h3, p {
    margin: 0;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: whitesmoke;
}

#title {
    margin-bottom: 0.5em;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: start;
}

@media(min-width: 512px){
    main {
        display: flex;
        flex-direction: row;
        align-items: stretch;
        justify-content: start;
        flex-wrap: wrap;
    }   
}

header {
    margin: 1em;
    padding: 0.5em;
}

.container {
    display: flex;
    flex-direction: column;
    padding: 1em;
    margin: 0 0.5em;
    align-items: center;
}

canvas {
    border: solid 1px gray;
    margin: 1em;
    border-radius: 5px;
    background-color: white;
}

#imgCanvas {
    width: min(80vw, 768px);
}

form {
    display: flex;
    flex-direction: column; 
}

fieldset {
    border-radius: 5px;
    margin: 0.5em 0;
    background-color: white;
}

legend {
    font-weight: bold;
}

#kernelOptions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 10px;
}

.kernelValue {
    background-color: rgb(240, 240, 240);
    border-radius: 5px;
    display: flex;
    align-items: center;
    column-gap: 10px;
    padding: 0.5em;
    cursor: pointer;
}

.selectedVal {
    background-color: rgb(210, 210, 210);
}

.kernelColor {
    width: 20px;
    height: 20px;
    border: solid 1px;
}

#kernel {
    display: grid;
    margin: 1em 0;
}

.kernelItem {
    aspect-ratio: 1;
    border: solid 1px gray;
    cursor: pointer;
}

#kernelResetButton {
    width: 100%;
}

#imgControlButton {
    padding: 0.5em 1em;
}

#kernelExampleList {
    list-style-type: none;
    margin: 1em 0;
    padding: 1em;
    background-color: white;
    border-radius: 5px;
    border: solid 1px gray;
}

.kernelExample {
    margin: 0.5em 0;
    align-items: center;
}

.kernelExample > button{
    padding: 0.25em 0.5em;
    margin-left: 0.5em;
}