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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

h1 {
    text-align: center;
    text-decoration: underline;
    margin-top: 16px;
    font-size: 40px;
}

.container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 20px;
}

.color-box {
    background-color: #da71d7;
    width: 200px;
    height: 200px;
    color: #fff;
    margin: 5px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 26px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    border: solid black 2px;
    border-radius: 5px;
}

button {
    background-image: linear-gradient(to right, #16222A 0%, #3A6073 51%, #16222A 100%);
    margin-top: 12px;
    padding: 10px 20px;
    transition: 0.4s;
    background-size: 200% auto;
    color: #fff;
    border-radius: 6px;
    font-size: 15px;
    cursor: pointer;
}

button:hover {
    background-position: right center;
}