CSS Chatbox UI: Responsive Messaging Interface

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<!DOCTYPE html>
<html>
<head>
    <title>Messaging Chatbox</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        /* Basic Reset and Setup */
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            margin: 0;
            background-color: #f0f2f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }

/* Chat Container Styling */
        #chat-container {
            width: 100%;
            max-width: 380px;
            height: 550px;
            background: white;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            border-radius: 10px;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

/* Header */
        #chat-header {
            padding: 15px;
            background-color: #007bff;
            color: white;
            font-size: 1.2em;
            font-weight: 600;
            text-align: center;
        }

/* Message Display Area */
        #messages {
            flex-grow: 1;
            padding: 15px;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
            background-color: #e5ddd5; /* WhatsApp-like background */
        }

/* Individual Message Bubble */
        .message {
            max-width: 75%;
            padding: 10px 12px;
            border-radius: 18px;
            line-height: 1.4;
            word-wrap: break-word;
            box-shadow: 0 1px 0.5px rgba(0, 0, 0, 0.13);
        }

/* Sent Messages (Right aligned) */
        .sent {
            align-self: flex-end;
            background-color: #dcf8c6; /* Light green */
            color: #1f2d33;
            border-bottom-right-radius: 4px; /* Tail effect */
        }

/* Received Messages (Left aligned) */
        .received {
            align-self: flex-start;
            background-color: white;
            color: #1f2d33;
            border-bottom-left-radius: 4px; /* Tail effect */
        }

/* Input Area */
        #input-area {
            display: flex;
            padding: 10px;
            border-top: 1px solid #ddd;
            background-color: #f0f2f5;
        }

#message-input {
            flex-grow: 1;
            padding: 10px 15px;
            border: none;
            border-radius: 20px;
            margin-right: 8px;
            font-size: 16px;
            outline: none;
        }

#send-button {
            background-color: #007bff;
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: 20px;
            cursor: pointer;
            transition: background-color 0.2s;
            font-weight: 600;
        }

#send-button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>

<div id="chat-container">
        <div id="chat-header">
            User Name / Group Chat
        </div>

<div id="messages">
            
            <div class="message received">Hey there! How are you doing today?</div>
            <div class="message sent">I'm great, thanks! Just testing out this new chat interface.</div>
            <div class="message received">It looks very responsive. Did you use Flexbox for the layout?</div>
            <div class="message sent">Yes, Flexbox for the container and message alignment. It makes alignment much easier!</div>
            <div class="message received">Awesome! Good job.</div>
        </div>

</body>
</html>

CSS Chatbox UI: Responsive Messaging Interface

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