body {
  scrollbar-color: black white;
  background-color:black;
  background-attachment: fixed;
  margin:7vmin 15vmin 7vmin 15vmin;
  font-family: Helvetica;
}

.holder {
  height: 100%;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.holder>div {
  flex: 1 0 50%;
}

.msg{
  padding: 1vmin;
  max-width: 35%;
  color: black;
}

.msg-center{
  background-color:black;
  align-self: center;
  text-align: center;
  color:white;
  margin: 2vmin;
  /*grid-column-start: 3;*/
}

.msg-right{
  background-color:white;
  align-self: end;
  text-align: right;
  /*grid-column-start: 3;*/
}

.msg-left{
  background-color:grey;
  align-self: start;
  /*grid-column-start: 1;*/
}

@media screen and (max-width: 800px) {
  .msg {
    max-width: 45%;
  }
  
  .body {
    margin:3vmin 0vmin 5vmin 0vmin;
  }
}