style.css

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&display=swap');
* {
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    padding: 0;
}


body{
    background: #CABE9C;
    font-size: 20px;
    line-height:50px;
    color: #000;
}

.header-area {
    font-size: 10px;
    height: 6%;
    background: #fff;
    text-align: center;
    box-shadow: 0 0.25rem 0.25rem rgba(0, 0, 0, 0.2), 0 0 1rem rgba(0, 0, 0, 0.2);
    color: darkslategray;
    margin-left: 300px;
    margin-right: 300px;
    margin-top: 100px;
    border: 2px solid #F6F6F6;
    
}
.message-area {
    height: 50%;
    padding: 3px;
    overflow: auto;
    margin-left: 300px;
    margin-right: 300px;
    background: #E6E6E6;
}

.typing-area {
    height: 8%;
    margin-left: 300px;
    margin-right: 350px;
}


.typing-area .typing-box {
    width: 90%;
    height: 100%;
    resize: none;
    padding: 3px;
}

.typing-area .send-button {
    border: 1px solid #000;
    width: 9%;
    height: 8%;
    background: radial-gradient(#9198e5, #2A9CFF);;
    color: white;
    padding-top: 7px;
    font-size: 18px;
    position: absolute;
    margin: 0px;
}

.message-box {
    margin-top: 10px;
}

.others-message-box {
}

.my-message-box {
    text-align: right;
    background: white;
}

.message {
    max-width: 70%;
    border-radius:8%;
    padding: 0px;
    min-height: 3%;
    box-shadow: 0 0.25rem 0.25rem rgba(0, 0, 0, 0.2), 0 0 1rem rgba(0, 0, 0, 0.2);
}

.my-message {
    margin-right:5px;
    float: right;
    text-align: left;
    font-size: 15px;
    background: #1AC453;
    color: white;
}

.others-message {
    margin-left:5px; 
    float: left;
    font-size: 15px;
    background: #868786;
    color: white;
}

.separator {
    width: 100%;
    height: 8px;
    float: left;
}