#stopwatch {
  background: #eee;
  border: 1px solid #999;
  padding: 20px;
  border-radius: 10px;
  max-width: 250px;
}
#sw-time {
  font-size: 48px;
  font-weight: bold;
  text-align: center;
}
#sw-rst, #sw-go {
  width: 45%;
  box-sizing: padding-box;
  padding: 10px;
  display: inline-block;
  background: #aa2f2f;
  border: 0;
  color: #fff;
}