HTML+CSS实现登陆页面样式布局、网页设计练习案例

<div class="container right-panel-active">
      <!-- Sign Up form1 -->
      <div class="container__form container--signup">
        <form action="#" class="form" id="form1" action="/Homepage.html">
          <h2 class="form__title">Sign Up</h2>
          <input
            type="text"
            id="UserName1"
            placeholder="User Name"
            class="input"
          />
          <input type="email" id="Email1" placeholder="Email" class="input" />
          <input
            type="password"
            id="Password1"
            placeholder="Password"
            class="input"
          />
          <span id="Password_length" class="regularity"></span>
          <span id="Password_irregularity" class="regularity"></span>
          <input
            type="password"
            id="ConfirmPassword1"
            placeholder=" ConfirmPassword"
            class="input"
          />
          <span id="Password_match" class="error"> </span>
          <button class="btn" id="registerBtn">Register</button>
          <button type="reset" class="btn" id="resetButton">Rest</button>
        </form>
      </div>

      <!-- Sign In form2 -->
      <div class="container__form container--signin">
        <form action="#" class="form" id="form2">
          <h2 class="form__title">Sign In</h2>
          <input
            type="text"
            id="UserName2"
            placeholder="User Name"
            class="input"
          />
          <span id="NameError" class="error"></span>
          <input
            type="password"
            id="Password2"
            placeholder="Password"
            class="input"
          />
          <span id="PasswordError" class="error"></span>
          <a href="#" class="link">Forgot your password?</a>
          <span id="lo" class="link"
            ><input type="checkbox" />No login for a week</span
          >
          <button class="btn">Sign In</button>
        </form>
      </div>

      <!-- Overlay -->
      <div class="container__overlay">
        <div class="overlay">
          <div class="overlay__panel overlay--left">
            <button class="btn" id="signIn">Sign In</button>
          </div>
          <div class="overlay__panel overlay--right">
            <button class="btn" id="signUp">Sign Up</button>
          </div>
        </div>
      </div>
    </div>

:root {
	/* COLORS */
	--white: #e9e9e9;
	--gray: #333;
	--blue: #5a3f23;
	--lightblue: #7f6141;

	/* RADII */
	--button-radius: 0.7rem;

	/* SIZES */
	--max-width: 50%;
	--max-height: 50%;

	font-size: 16px;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
		Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

body {
	align-items: center;
	background-color: var(--white);
	background: url("images_nav/pexels-photo-4620843.jpeg");
	background-attachment: fixed;
	background-position: center;
	background-repeat: no-repeat;
	background-size: cover;
	display: grid;
	height: 100vh;
	margin: 0px;
	place-items: center;
}

.form__title {
	font-weight: 300;
	margin: 0;
	margin-bottom: 1.25rem;
}

.link {
	color: var(--gray);
	font-size: 1.2rem;
	margin: 0.7rem 0;
	text-decoration: none;
}

.container {
	background-color: var(--white);
	border-radius: var(--button-radius);
	box-shadow: 0 0.9rem 1.7rem rgba(0, 0, 0, 0.25),
		0 0.7rem 0.7rem rgba(0, 0, 0, 0.22);
	height: var(--max-height);
	max-width: var(--max-width);
	overflow: hidden;
	position: relative;
	width: 100%;
	margin-top: -150px;
}

.container__form {
	height: 100%;
	position: absolute;
	top: 0;
	transition: all 0.6s ease-in-out;
}

.container--signin {
	left: 0;
	width: 50%;
	z-index: 3;
}

.container.right-panel-active .container--signin {
	transform: translateX(100%);
}

.container--signup {
	left: 0;
	opacity: 0;
	width: 50%;
	z-index: 2;
}

.container.right-panel-active .container--signup {
	animation: show 0.6s;
	opacity: 1;
	transform: translateX(100%);
	z-index: 6;
}

.container__overlay {
	height: 100%;
	left: 50%;
	overflow: hidden;
	position: absolute;
	top: 0;
	transition: transform 0.6s ease-in-out;
	width: 50%;
	z-index: 100;
}

.container.right-panel-active .container__overlay {
	transform: translateX(-100%);
}

.overlay {
	background-color: var(--lightblue);
	background: url("images_nav/pexels-photo-4620821.jpeg");
	background-size: 500px auto;

	background-attachment: fixed;
	background-position: center;
	background-repeat: no-repeat;
	background-size: cover;
	height: 100%;
	left: -100%;
	position: relative;
	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
	width: 200%;
}

.container.right-panel-active .overlay {
	transform: translateX(50%);
}

.overlay__panel {
	align-items: center;
	display: flex;
	flex-direction: column;
	height: 100%;
	justify-content: center;
	position: absolute;
	text-align: center;
	top: 0;
	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
	width: 50%;
}

.overlay--left {
	transform: translateX(-20%);
}

.container.right-panel-active .overlay--left {
	transform: translateX(0);
}

.overlay--right {
	right: 0;
	transform: translateX(0);
}

.container.right-panel-active .overlay--right {
	transform: translateX(20%);
}

.btn {
	background-color: var(--blue);
	background-image: linear-gradient(90deg, var(--blue) 0%, var(--lightblue) 74%);
	border-radius: 20px;
	border: 1px solid var(--blue);
	color: var(--white);
	cursor: pointer;
	font-size: 1.2rem;
	font-weight: bold;
	letter-spacing: 0.2rem;
	padding: 0.9rem 4rem;
	text-transform: uppercase;
	transition: transform 80ms ease-in;
}

.form > .btn {
	margin-top: 0.8rem;
}

.btn:active {
	transform: scale(0.95);
}

.btn:focus {
	outline: none;
}

全代码放在资源里传送门