styles.css

body, html {
    margin: 0px;
    padding:0px;
    width: 100%;
    height: 100%;
    background-color: #2b2a38;
    font-family: 'Poppins', sans-serif;
    font-size: 18px;
    font-weight: 300;
    display: flex;
    scroll-behavior: smooth;
}

* {
    box-sizing: border-box;
}

#container {
    max-width:460px;
    margin:auto;
    background-color: #252433;
    border-radius: 15px;
    -webkit-box-shadow: 0px 11px 27px 5px rgba(39,39,52,0.79); 
    box-shadow: 0px 11px 27px 5px rgba(39,39,52,0.79);
    overflow: hidden;
    position: relative;
}

.header {
    background-color: #f85e62;
    width: 100%;
    height: 84px;
    color: white;
    padding: 20px;
    font-weight: 500;
    font-size: 17px;
    position: relative;
}

.header small {
    font-size: 14px;
    font-weight: 200;
}

.header > div:first-of-type {
    display: inline-block;
}

.header > div:last-of-type {
    display: inline-block;
    vertical-align: top;
    margin-left: 10px;
}

.header img {
    border-radius:50%;
    border:2px solid white;
}

.header img:not(:first-of-type) {
    margin-left: -25px;
}


#chat {
    background-color: #252433;
    width: 460px;
    height: 600px;
    overflow-y: auto;
}

.notice {
    background-color: #343344;
    width: 100%;
    padding: 30px;
    color: white;
    font-size: 14px;
    position: absolute;
    bottom: 0;

}

.notice a, .notice a:hover {
    text-decoration: underline;
    color: #f86266;
}

.notice button {
    padding: 15px 30px;
    border: 1px solid #f86266;
    background-color: #343344;
    border-radius: 35px;
    color: #f86266;
    font-size: 16px;
    margin-top: 20px;
    transition: all .3s ease;
}

.notice button:hover {
    background-color: #f86266;
    color: white;
    cursor: pointer;
}

#text {
    width: 100%;
    margin: auto;
    height: 70px;
    padding: 10px;
    background-color: white;
    border-bottom-left-radius: 25px;
    border-bottom-right-radius: 25px;
}

#text input[type=text] {
    border:1px solid white;
    margin-top: 4px;
    padding: 10px;
    font-size: 18px;
    width: 80%;
}

#text ::placeholder {
    color: rgb(167, 167, 167);
}

#text svg {
    float: right;
    padding-right: 10px;
    box-sizing: content-box;
    padding-top: 5px;
    cursor: pointer;
    transition: all .3s ease;
}

#text svg:hover {
    stroke: #f85e62;
}

.bubble {
    position: relative;
    background: #343344;
    color: #FFFFFF;
    font-size: 14px;
    text-align: left;
    width: 100%;
    border-radius: 10px;
    padding: 20px;
    margin: 0px;
    display: inline-block;
}

.bubble:after {
    content: '';
    position: absolute;
    display: block;
    width: 0;
    z-index: 1;
    border-style: solid;
    border-color: transparent #343344;
    border-width: 8px 8px 8px 0;
    top: 20px;
    left: -8px;
    margin-top: -8px;
}

.bubble2 {
    position: relative;
    background: #343344;
    color: #FFFFFF;
    font-size: 14px;
    text-align: left;
    width: 100%;
    border-radius: 10px;
    padding: 20px;
    margin: 0px;
    display: inline-block;
}

.bubble2:before {
    content: '';
    position: absolute;
    display: block;
    width: 0;
    z-index: 1;
    border-style: solid;
    border-color: transparent #343344;
    border-width: 8px 0px 8px 8px;
    top: 20px;
    right: -8px;
    margin-top: -8px;
}

.chatLine {
    display: flex;
    width: 100%;
    padding: 10px 20px;
  }
  
.chatLine > div {
    flex-grow: 1;
}

.chatLine > div.myself {
    max-width: 90px;
}

.chatLine > div.operator {
    max-width: 90px;
}

.chatLine > div img {
    border-radius: 50%;
    border:2px solid white;
    margin-right: 20px;
}
  
.chatLine > div img.reverse {
    border-radius: 50%;
    border:2px solid white;
    margin-left: 20px;
}
  
  *:focus {
    outline: none;
}