styles.css

:root { font-size: 1.125rem; }
@media (min-width: 600px) { :root { font-size: 1.5rem; } }
@media (min-width: 900px) { :root { font-size: 1.75rem; } }
@media (min-width: 1200px) { :root { font-size: 2rem; } }
*, *:before, *:after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100vw;
  min-height: 100vh;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: #FFF;
}
.textsInBubbles {
  overflow: auto;
  width: 100vw;
  max-height: 100vh;
  padding: 1rem .9rem;
}
.bubble {
  overflow: hidden;
  display: inline-block;
  margin: 0 0 .125rem 0;
  padding: .5rem .85rem;
  line-height: 1.25rem;
  border-radius: 1.25rem;
  transform-origin: 0 100%;
  vertical-align: middle;
  transition: border-radius .25s ease-out .075s;
}
.bubble.left.cornered {
  border-bottom-left-radius: 0;
}
.bubble.left {
  background: rgba(206,206,206,0.50);
}
.bubble:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: -.5rem;
  width: .5rem;
  height: .5rem;
  background-image: url(../img/corner.svg);
  background-size: .5rem .5rem;
  background-position: .5rem 0;
  background-repeat: no-repeat;
  transition: background-position .15s ease-in;
}
.bubble.cornered:after {
  background-position: 0 0;
}
.bubble span {
  display: block;
}
.bubble span.message {
  opacity: 0;
}
.bubble a {
  color: #0076FF;
}
.bubble .loading {
  position: absolute;
  width: 2.25rem;
  font-size: 2rem;
  line-height: 1rem;
}
.bubble .loading b {
  display: inline-block;
  color: rgba(0,0,0,.5);
}