小编vid*_*zer的帖子

button,
input {
  font-size: 1rem;
}

button {
  border: none;
  background-color: #333;
  color: #EEE;
}

input {
  border: 1px solid #AAA;
  padding-left: 0.5rem;
}

.inputrow {
  width: 30rem;
  display: flex;
  margin: 0 -.25rem;
}

.inputrow>* {
  margin: 0 .25rem;
  border-radius: 2px;
  height: 1.75rem;
  box-sizing: border-box;
}

.nickname {
  flex: 1;
}

.message {
  flex: 4;
}

.s-button {
  flex: 1;
}

<div class="inputrow">
  <input type="text" class="nickname" placeholder="Nickname">
  <input type="text" class="message" placeholder="Message">
  <button type="submit" class="s-button">Submit</button> …