JSFiddle - React, Tailwind, and code Playground

HTML

<div class="message-container customer">
  <p class="message">Great thanks</p>
</div>

CSS

.message {
  width: auto;
  max-width: 66%;
  padding: 12px 30px;
  box-sizing: border-box;
  background: #ffffff;
  box-shadow: 0 2px 0 2px rgba(177, 177, 177, .07), 0 2px 0 0 rgba(0, 0, 0, .1);
  margin: 4px 0 0 0;
  position: relative;
  float: right;
  border-right: 4px solid #0892cb;
  border-radius: 5px 0 0 5px;
}

.message:after {
    top: 100%;
    right: 0;
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
    border-color: rgba(255, 255, 255, 0);
    border-bottom-color: #FFFFFF;
    border-width: 10px;
    margin-right: -14px;
    margin-top: -10px;
    transform: rotate(45deg);
    box-shadow: 0 2px 0 2px rgba(177, 177, 177, .07), 0 2px 0 0 rgba(0, 0, 0, .1);
  }