:root {
    --grid-width: 600px;
    --accent-color: #04AA6D;
    --inactive-color: rgba(0, 0, 0, 0.25);
}
* {
    margin: 0;
    padding: 0;
}
body {
    background-color: aliceblue;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}

.container {
    margin: 0 auto;
    width: var(--grid-width);
}

.top {
    display: flex;
    padding: 3px;
    margin-top: 100px;
    background-color: inherit;
    color: var(--inactive-color);
    width: fit-content;
    margin-bottom: 6px;
}

.button-cat {
    font-size: small;
    color: rgba(0, 0, 0, 0.473);
}

.top-button {
    display: flex;
    align-items: center;
    background-color: white;
    padding: 6px;
    margin-right: 9px;
}
.top-button:hover {
    color: #04AA6D;
}

.top-button > span {
    cursor: pointer;
    margin-right: 3px;
}

#pen-color {
    border: none;
}

#sketch-area {
    display: flex;
    flex-wrap: wrap;
    margin: 0 auto;
    background-color: white;
}

.slider {
    appearance: none;
    height: 25px;
    width: 100%;
    background: rgba(200, 225, 238, 0.726);
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
}

#slider-value {
    margin: 0 auto;
    text-align: center;
}
.slider:hover {
    opacity: 1;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 25px;
    height: 25px;
    background: var(--accent-color);
    cursor: pointer;
}