button{margin:4px}.content{display:flex;justify-content:center}.user{padding:20px}.message{padding:2px 4px;margin:0}.message-box-message{width:150px}.message-box-received{height:200px;width:200px;overflow-y:auto;border:solid 1px;margin-top:10px}.message-box-received.disabled{border-color:#d3d3d3}