* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    min-height: 100vh;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: #333;
    font-family: Arial, Helvetica, sans-serif;
}

h1 {
    color: #FFF;
    margin-bottom: 20px;
}

#tela {
    border: 2px solid #000;
    background-color: #FFF;
    cursor: crosshair;
}

.colorArea {
    width: 800px;
    display: flex;
}
.color {
    flex: 1;
    height: 40px;
    cursor: pointer;
}
.color.active {
    border: 5px solid #FFF;
}

.clear {
    border: 1px solid #000;
    background-color: rgba(0, 0, 0, 0.2);
    color: #FFF;
    padding: 10px;
    margin-top: 20px;
    cursor: pointer;
}

footer {
    margin-top: 20px;
    color: #FFF;
    font-size: 13px;
}