html {
  background-repeat: no-repeat;
  background-position: bottom left;
  height: 100%;
  background-size: 25vw;
}
html body {
  overflow: hidden;
}
.demo-buttons {
  position: fixed;
  top: 20px;
}
.sample-button {
  background-color: #0392cf;
  border-style: none;
  color: #ffffff;
  width: 80px;
  height: 40px;
  border-radius: 5px;
  font-size: 16px;
}
#messenger-container {
  width: 350px;
  height: 500px;
  position: absolute;
  margin: 0 auto;
  left: 0;
  right: 0;
}
header {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  height: 62px;
  border-style: solid;
  border-width: 1px;
  border-color: #979797;
  padding-left: 11px;
}
.header-title {
  display: flex;
  flex: 1;
  align-items: flex-end;
  font-family: Roboto;
  font-size: 18px;
  color: #131313;
  height: 21px;
}
.header-description {
  display: flex;
  flex: 1;
  font-family: Roboto;
  font-size: 14px;
  height: 16px;
  color: rgba(19, 19, 19, 0.8);
}
@media (max-width: 768px) {
  #messenger-container {
      top: 60px;
 }
}