body {
    font-family: Arial, sans-serif;
    background-color: #000;
    color: #fff;
    margin: 0;
    display: flex;
}
.sidebar {
    width: 250px;
    background: #151515;
    height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
}
.sidebar h2 {
    color: #1DA1F2;
}
.sidebar ul {
    list-style: none;
    padding: 0;
}
.sidebar ul li {
    padding: 10px 0;
}
.sidebar ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 18px;
}
.sidebar .tweet-btn {
    margin-top: 20px;
    padding: 10px;
    background-color: #1DA1F2;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 20px;
    font-size: 16px;
}
.sidebar .tweet-btn:hover {
    background-color: #0d8ddb;
}
.main-content {
    flex: 1;
    padding: 20px;
}
header {
    text-align: center;
    font-size: 24px;
    font-weight: bold;
    padding-bottom: 10px;
}
.post-tweet {
    display: flex;
    flex-direction: column;
    background: #222;
    padding: 10px;
    border-radius: 10px;
}
textarea {
    width: 100%;
    height: 50px;
    margin-bottom: 10px;
    padding: 5px;
    background: #333;
    color: white;
    border: none;
    border-radius: 5px;
}
button {
    padding: 10px;
    background-color: #1DA1F2;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}
button:hover {
    background-color: #0d8ddb;
}
#tweets {
    margin-top: 20px;
}
.tweet {
    background: #222;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 10px;
    border: 1px solid #333;
}