style.css

body {
    margin: 0;
    padding: 0;
}

.heading {
    text-align: center;
    font-family: sans-serif;
}

.container {
    height: 500px;
    width: 56%;
    margin: auto;
    padding: 10px;
    background-color: aliceblue;
    border: 2px solid #74d4da;
    border-radius: 2px;
    overflow-y: auto;
}

.message {
    margin: 4px 0px;
    padding: 4px;
    border: 2px solid #c4c0c8;
    border-radius: 8px;
    background-color: #DCF8C6;
    max-width: 80%;
    word-wrap: break-word;
    font-size: 14px;
    font-family: sans-serif
}

.left {
    float: left;
    clear: both;
}

.right {
    float: right;
    clear: both;
}

.middle {
    text-align: center;
    margin: auto;
    margin-top: 4px;
    clear: both;
    max-width: 40%;
    background-color: #1effc9b0;
}

.bottomDiv {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.ipt {
    height: 20px;
    width: 54%;
    padding: 4px;
    font-size: 14px;
    border: 2px solid #c4c0c8;
    font-family: sans-serif;
    border-radius: 2px;
}

.ipt:focus {
    outline: 2px solid #c4c0c8;
}

.image {
    height: 32px;
    width: 32px;
    margin-left: 10px;
    cursor: pointer;
}