body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f1f1f1;
}

.container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 30%;
    background-color: #ffffff;
    border-right: 1px solid #ddd;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 15px;
    background-color: #1da1f2;
    color: white;
    text-align: center;
    position: relative;
}

#search-bar {
    width: calc(100% - 30px);
    padding: 10px;
    margin: 10px 15px;
    border: none;
    border-radius: 20px;
}

.contacts {
    flex-grow: 1;
    overflow-y: auto;
}

.contact {
    display: flex;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #ddd;
    cursor: pointer;
    transition: background-color 0.3s;
}

.contact:hover {
    background-color: #f1f1f1;
}

.avatar {
    width: 50px;
    height: 50px;
    background-color: #ddd;
    border-radius: 50%;
    margin-right: 10px;
}

.contact-info h3 {
    margin: 0;
    font-size: 16px;
}

.contact-info p {
    margin: 5px 0 0;
    color: gray;
}

.chat-area {
    width: 70%;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 15px;
    background-color: #1da1f2;
    color: white;
    text-align: center;
}

.chat-messages {
    flex-grow: 1;
    padding: 20px;
    background-color: #e5ddd5;
    overflow-y: auto;
}

.message {
    max-width: 60%;
    margin: 10px 0;
    padding: 10px 15px;
    border-radius: 20px;
    line-height: 1.5;
}

.message.received {
    background-color: #ffffff;
    align-self: flex-start;
}

.message.sent {
    background-color: #dcf8c6;
    align-self: flex-end;
}

.chat-input {
    display: flex;
    border-top: 1px solid #ddd;
    padding: 10px;
    background-color: #ffffff;
}

.chat-input input {
    flex-grow: 1;
    padding: 10px;
    border: none;
    border-radius: 20px;
    margin-right: 10px;
    background-color: #f1f1f1;
}

.chat-input button {
    padding: 10px 20px;
    border: none;
    background-color: #1da1f2;
    color: white;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.chat-input button:hover {
    background-color: #0d8edc;
}