body {
  font-family: sans-serif;
  background: #eef2f5;
  display: flex;
  height: 100vh;
  align-items: center;
  justify-content: center;
}
.container {
  background: #fff;
  padding: 1rem;
  border-radius: 6px;
  width: 320px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
#log {
  width: 100%;
  height: 140px;
  margin-bottom: 0.5rem;
  resize: none;
}
#msg {
  width: calc(100% - 60px);
}
textarea {
  width: 100%;
  margin-top: 0.5rem;
  resize: none;
}
button {
  margin: 0.3rem 0.1rem;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
}