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

html {
    font-size: 16px;
    line-height: 1.5;
    font-family: 'Arial', sans-serif;
    color: #333;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

div {
    width: 640px;
    background-color: #f4f4f4;
    border: 1px solid #ccc;
    border-radius: 8px;
    text-align: left;
    padding: 20px;
}

textarea {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 150px;
    font-size: 16px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: bold;
    margin-bottom: 0.5em;
}

p {
    margin-bottom: 1em;
}

a {
    color: #007bff;
    text-decoration: none;
}

a:hover, a:focus {
    text-decoration: underline;
}

ul, ol {
    margin: 0;
    padding: 0 1.5em;
}

input, textarea, select, button {
    font-family: inherit;
    font-size: 1rem;
    padding: 0.5em;
    margin: 0.5em 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}

:focus {
    outline: 2px dashed #007bff;
    outline-offset: 2px;
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
}