body {
    font-family: Arial;
    background: #f0f2f5;
    margin: 0;
}

.topbar {
    background: #1877f2;
    padding: 12px;
    text-align: center;
}
.topbar a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
    font-size: 18px;
}

.post-box, .post, .profile-box {
    width: 90%;
    max-width: 500px;
    background: #fff;
    padding: 15px;
    margin: 15px auto;
    border-radius: 10px;
}

textarea {
    width: 100%;
    height: 80px;
    padding: 10px;
}

.post-img {
    width: 100%;
    margin-top: 10px;
    border-radius: 10px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.profile-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
}