* {
  margin: 0;
  padding: 0;
}
html,
body {
  height: 100%;
}

.container {
  width: 100%;
  height: 100%;
  background-color: #0556c6;
  display: grid;
  grid-template-columns: 3fr 4fr;
  place-items: center;
  color: white;
}

.left-container {
  text-shadow: 2px 2px 2px #00000066;
}

h1 {
  margin-bottom: 30px;
  font-size: 4vw;
}

h3 {
  margin-bottom: 10px;
  margin-top: 22px;
  font-size: 2vw;
}

p {
  font-size: 1.4vw;
  line-height: 1.5em;
}

.right-container {
}

#qrcode {
  box-shadow: 0px 0px 17px 12px rgb(0 0 0 / 50%);
  border-radius: 50%;
  display: block;
  width: min(40vw, 68vh);
  height: min(40vw, 68vh);
}

#refreshTimeCountDown {
  text-align: center;
  margin-top: 30px;
  font-size: 2em;
  color: #ffffff9c;
}

/* 右上角按钮 */
.ctrl-btn {
  position: absolute;
  right: 0;
  top: 0;
  padding: 10px;
}

.btn {
  width: 32px;
  height: 32px;
  cursor: pointer;
  filter: invert(1) opacity(0.8);
}

.btn-ctrl {
  margin-left: 2px;
  vertical-align: middle;
}

#fullscreen-button {
  width: 28px;
  height: 28px;
}
