style.css

html, body {
  margin: 0;
  padding: 0
}

*, *:before, *:after {
     -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

table, th, td {
border: 1px solid black;
}

th {
  text-align: left
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

#main {
  display: -webkit-box;
  -webkit-box-orient: horizontal;
  width: 100%;
  /*height: 100%; */
  position: absolute;
  border-top: 1px solid rgba(0,0,0,0.15);
}

#messages-container {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  -webkit-box-flex: 1;
  border-bottom: 1px solid #CCC;
}

.messages {
  display: table;
}

.message {
  display: table-row;
  -webkit-user-select: initial;
}

::-webkit-scrollbar {
  width: 9px;
  height: 9px;
}
::-webkit-scrollbar-button:start:decrement,
::-webkit-scrollbar-button:end:increment {
  display: block;
  height: 0;
}
::-webkit-scrollbar-track-piece {
  background-color: rgba(0,0,0,0.1);
}
::-webkit-scrollbar-thumb:vertical {
  height: 50px;
  background-color: #999;
  border-radius: 8px;
}
::-webkit-scrollbar-thumb:vertical:hover {
  background-color: #888;
}
::-webkit-scrollbar-thumb:horizontal {
  width: 50px;
  background-color: #999;
  border-radius: 8px;
}