* {
  /* 初始化 */
  margin: 0;
  padding: 0;
}
body {
  /* 100%窗口高度 */
  height: 100vh;
  /* 弹性布局 居中 */
  display: flex;
  justify-content: center;
  align-items: center;
  /* 渐变背景 */
  background: linear-gradient(200deg, #72afd3, #96fbc4);
}
.login-box {
  /* 相对定位 */
  position: relative;
  width: 320px;
}
.input-box {
  /* 弹性布局 垂直排列 */
  display: flex;
  flex-direction: column;
}
.input-box input {
  height: 40px;
  border-radius: 3px;
  /* 缩进15像素 */
  text-indent: 15px;
  outline: none;
  border: none;
  margin-bottom: 15px;
}
.input-box input:focus {
  outline: 1px solid lightseagreen;
}
.input-box button {
  border: none;
  height: 45px;
  background-color: lightseagreen;
  color: #fff;
  border-radius: 3px;
  cursor: pointer;
}
/* 接下来是猫头鹰的样式 */
.owl {
  width: 211px;
  height: 108px;
  /* 背景图片 */
  background: url("/owl-login.png") no-repeat;
  /* 绝对定位 */
  position: absolute;
  top: -100px;
  /* 水平居中 */
  left: 50%;
  transform: translateX(-50%);
}
.owl .hand {
  width: 34px;
  height: 34px;
  border-radius: 40px;
  background-color: #472d20;
  /* 绝对定位 */
  position: absolute;
  left: 12px;
  bottom: -8px;
  /* 沿Y轴缩放0.6倍（压扁） */
  transform: scaleY(0.6);
  /* 动画过渡 */
  transition: 0.3s ease-out;
}
.owl .hand.hand-r {
  left: 170px;
}
.owl.password .hand {
  transform: translateX(42px) translateY(-15px) scale(0.7);
}
.owl.password .hand.hand-r {
  transform: translateX(-42px) translateY(-15px) scale(0.7);
}
.owl .arms {
  position: absolute;
  top: 58px;
  width: 100%;
  height: 41px;
  overflow: hidden;
}
.owl .arms .arm {
  width: 40px;
  height: 65px;
  position: absolute;
  left: 20px;
  top: 40px;
  background: url("/owl-login-arm.png") no-repeat;
  transform: rotate(-20deg);
  transition: 0.3s ease-out;
}
.owl .arms .arm.arm-r {
  transform: rotate(20deg) scaleX(-1);
  left: 158px;
}
.owl.password .arms .arm {
  transform: translateY(-40px) translateX(40px);
}
.owl.password .arms .arm.arm-r {
  transform: translateY(-40px) translateX(-40px) scaleX(-1);
}