简介美观的登录注册页面

小知识，大挑战！本文正在参与“程序员必备小知识”创作活动。

<p class="tip"></p>
<div class="cont">
  <div class="form sign-in">
    <h2>欢迎回来</h2>
    <label>
      <span>电子邮件</span>
      <input type="email" />
    </label>
    <label>
      <span>
		密码</span>
      <input type="password" />
    </label>
    <p class="forgot-pass">
		忘记密码？</p>
    <button type="button" class="submit">登录</button>
  </div>
  <div class="sub-cont">
    <div class="img">
      <div class="img__text m--up">
        <h2>新来的？</h2>
        <p>注册并发现跟多朋友吧</p>
      </div>
      <div class="img__text m--in">
        <h2>登录?</h2>
        <p>如果您已经有帐户，只需登录即可。我们想念您！</p>
      </div>
      <div class="img__btn">
        <span class="m--up">注册</span>
        <span class="m--in">登录</span>
      </div>
    </div>
    <div class="form sign-up">
      <h2>欢迎注册</h2>
      <label>
        <span>名字</span>
        <input type="text" />
      </label>
      <label>
        <span>邮箱</span>
        <input type="email" />
      </label>
      <label>
        <span>密码</span>
        <input type="password" />
      </label>
      <button type="button" class="submit">注册</button>
    </div>
  </div>
</div>

		@import url("https://fonts.googleapis.com/css?family=Open+Sans");
*, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Open Sans", Helvetica, Arial, sans-serif;
  background:#1F1F1F;
}

input, button {
  border: none;
  outline: none;
  background: none;
  font-family: "Open Sans", Helvetica, Arial, sans-serif;
}

.tip {
  font-size: 20px;
  margin: 40px auto 50px;
  text-align: center;
}

.cont {
  overflow: hidden;
  position: relative;
  width: 900px;
  height: 550px;
  margin: 0 auto 100px;
  background: #fff;
}

.form {
  position: relative;
  width: 640px;
  height: 100%;
  transition: transform 1.2s ease-in-out;
  padding: 50px 30px 0;
}

.sub-cont {
  overflow: hidden;
  position: absolute;
  left: 640px;
  top: 0;
  width: 900px;
  height: 100%;
  padding-left: 260px;
  background: #fff;
  transition: transform 1.2s ease-in-out;
}
.cont.s--signup .sub-cont {
  transform: translate3d(-640px, 0, 0);
}

button {
  display: block;
  margin: 0 auto;
  width: 260px;
  height: 36px;
  border-radius: 30px;
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

.img {
  overflow: hidden;
  z-index: 2;
  position: absolute;
  left: 0;
  top: 0;
  width: 260px;
  height: 100%;
  padding-top: 360px;
}
.img:before {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 900px;
  height: 100%;
  background-image: url("https://images.unsplash.com/photo-1604941138781-78fbefc0d888?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1817&q=80");
  background-size: cover;
  transition: transform 1.2s ease-in-out;
}
.img:after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
}
.cont.s--signup .img:before {
  transform: translate3d(640px, 0, 0);
}
.img__text {
  z-index: 2;
  position: absolute;
  left: 0;
  top: 50px;
  width: 100%;
  padding: 0 20px;
  text-align: center;
  color: #fff;
  transition: transform 1.2s ease-in-out;
}
.img__text h2 {
  margin-bottom: 10px;
  font-weight: normal;
}
.img__text p {
  font-size: 14px;
  line-height: 1.5;
}
.cont.s--signup .img__text.m--up {
  transform: translateX(520px);
}
.img__text.m--in {
  transform: translateX(-520px);
}
.cont.s--signup .img__text.m--in {
  transform: translateX(0);
}
.img__btn {
  overflow: hidden;
  z-index: 2;
  position: relative;
  width: 100px;
  height: 36px;
  margin: 0 auto;
  background: transparent;
  color: #fff;
  text-transform: uppercase;
  font-size: 15px;
  cursor: pointer;
}
.img__btn:after {
  content: "";
  z-index: 2;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  border: 2px solid #fff;
  border-radius: 30px;
}
.img__btn span {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  transition: transform 1.2s;
}
.img__btn span.m--in {
  transform: translateY(-72px);
}
.cont.s--signup .img__btn span.m--in {
  transform: translateY(0);
}
.cont.s--signup .img__btn span.m--up {
  transform: translateY(72px);
}

h2 {
  width: 100%;
  font-size: 26px;
  text-align: center;
}

label {
  display: block;
  width: 260px;
  margin: 25px auto 0;
  text-align: center;
}
label span {
  font-size: 12px;
  color: #cfcfcf;
  text-transform: uppercase;
}

input {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding-bottom: 5px;
  font-size: 16px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.4);
  text-align: center;
}

.forgot-pass {
  margin-top: 15px;
  text-align: center;
  font-size: 12px;
  color: #cfcfcf;
}

.submit {
  margin-top: 40px;
  margin-bottom: 20px;
  background: #d4af7a;
  text-transform: uppercase;
}

.fb-btn {
  border: 2px solid #d3dae9;
  color: #8fa1c7;
}
.fb-btn span {
  font-weight: bold;
  color: #455a81;
}

.sign-in {
  transition-timing-function: ease-out;
}
.cont.s--signup .sign-in {
  transition-timing-function: ease-in-out;
  transition-duration: 1.2s;
  transform: translate3d(640px, 0, 0);
}

.sign-up {
  transform: translate3d(-900px, 0, 0);
}
.cont.s--signup .sign-up {
  transform: translate3d(0, 0, 0);
}

document.querySelector('.img__btn').addEventListener('click', function() {
  document.querySelector('.cont').classList.toggle('s--signup');
});