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CSS

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JavaScript

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HTML 

              
                <div class="sp-pp">
  <div class="container">
    <h1>SitePoint</h1>
    <h2>Sign In</h2>
    <fieldset class="form-fieldset ui-input __first">
      <input type="text" id="username" required/>
      <label for="username">
        <span data-text="Username">Username</span>
      </label>
    </fieldset>

    <fieldset class="form-fieldset ui-input __second">
      <input type="password" id="password" required/>
      <label for="password">
        <span data-text="Password">Password</span>
      </label>
    </fieldset>

    <div class="form-footer">
      <input type="submit" class="btn" value="Log In" />
    </div>
  </div>
</div>
!

CSS 

              
                /* css class for the login generated errors */
.profilepress-login-status {
  background-color: #363E4A;
  color: #ffffff;
  max-width: 342px;
  margin: 1px auto;
  border: medium none;
  font-size: 15px;
  font-weight: normal;
  border-radius: 4px;
  text-align: center;
  line-height: 1.4;
  padding: 8px 5px;
}

.profilepress-login-status a {
  color: #ea9629 !important;
}

div.sp-pp h1 {
  color: #fff;
  font-family: "Texta", "Avenir Next", "Avenir", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 4px;
  text-align: center;
}

div.sp-pp h2 {
  font-weight: 400;
  font-size: 24px;
  color: rgba(255, 255, 255, 0.4);
}

div.sp-pp .container {
  font-family: "Avenir Next", "Avenir", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  color: #ffffff;
  line-height: 1.5;
  background-color: #363E4A;
  max-width: 320px;
  margin: 0 auto;
  padding: 20px 16px 40px 16px;
  text-align: center;
}

div.sp-pp .form-footer {
  margin-top: 1em;
}

div.sp-pp .ui-input {
  position: relative;
  padding: 0;
  border: 0;
}

div.sp-pp .ui-input input {
  border: 0;
  color: #fff;
  background: none;
  padding: 16px 0 16px 0;
  font-size: 24px;
  outline: 0;
  width: 100%;
  tap-highlight-color: transparent;
  touch-callout: none;
}

div.sp-pp .ui-input input + label {
  position: relative;
  display: block;
  padding: 8px 0 8px 0;
  text-transform: uppercase;
  font-size: 14px;
  letter-spacing: .0875em;
  font-weight: 500;
  text-align: left;
}

div.sp-pp .ui-input input + label::before,
div.sp-pp .ui-input input + label::after {
  position: absolute;
  top: 0;
  left: 0;
  content: "";
  width: 100%;
  height: 1px;
}

.ui-input input + label::before {
  background-color: rgba(255, 255, 255, 0.2);
}

div.sp-pp .ui-input input + label::after {
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms cubic-bezier(0.215, 0.61, 0.355, 1);
  background-color: #6EB1FF;
  height: 2px;
}

div.sp-pp .ui-input input + label span {
  position: relative;
  color: rgba(255, 255, 255, 0.2);
  transition: color 300ms cubic-bezier(0.215, 0.61, 0.355, 1);
}

div.sp-pp .ui-input input + label span::after {
  content: attr(data-text);
  position: absolute;
  overflow: hidden;
  left: 0;
  transform: scaleX(1);
  white-space: nowrap;
  color: #fff;
  background-image: linear-gradient(to right, #4A90E2 50%, rgba(255, 255, 255, 0) 0%);
  background-position: 100% 50%;
  background-size: 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  backface-visibility: hidden;
  perspective: 1000;
  transform: translateZ(0);
  transition: background-position 300ms cubic-bezier(0.215, 0.61, 0.355, 1);
}

div.sp-pp .ui-input input:focus + label::after,
div.sp-pp .ui-input input.error + label::after,
div.sp-pp .ui-input input:invalid + label::after,
div.sp-pp .ui-input input.filled + label::after {
  transform: scaleX(1);
  transform-origin: left;
}

div.sp-pp .ui-input input:focus + label span::after,
div.sp-pp .ui-input input.error + label span::after,
div.sp-pp .ui-input input:invalid + label span::after,
div.sp-pp .ui-input input.filled + label span::after {
  background-image: linear-gradient(to right, white 50%, rgba(255, 255, 255, 0) 0%);
  background-position: 0% 50%;
}

div.sp-pp .ui-input input.filled {
  color: #ffffff;
}

div.sp-pp .ui-input input.filled + label::after {
  background-color: #ffffff;
}

div.sp-pp .ui-input input.filled + label span::after {
  background-image: linear-gradient(to right, #ffffff 50%, rgba(255, 255, 255, 0) 0%);
  background-position: 0% 50%;
}

div.sp-pp .ui-input input:focus {
  color: #6EB1FF;
}

div.sp-pp .ui-input input:focus + label::after {
  background-color: #6EB1FF;
}

div.sp-pp .ui-input input:focus + label span::after {
  background-image: linear-gradient(to right, #6EB1FF 50%, rgba(255, 255, 255, 0) 0%);
  background-position: 0% 50%;
}

div.sp-pp .ui-input input.error,
div.sp-pp .ui-input input:invalid {
  color: #E66161;
}

div.sp-pp .ui-input input.error + label::after,
div.sp-pp .ui-input input:invalid + label::after {
  background-color: #E66161;
}

div.sp-pp .ui-input input.error + label span::after,
div.sp-pp .ui-input input:invalid + label span::after {
  background-image: linear-gradient(to right, #E66161 50%, rgba(255, 255, 255, 0) 0%);
  background-position: 0% 50%;
}

div.sp-pp .btn {
  border: 0;
  color: #fff;
  background-color: #50617A;
  padding: 18px 30px 18px 30px;
  font-size: 18px;
  text-transform: uppercase;
  letter-spacing: .0875em;
  font-weight: 500;
  border-radius: 100px;
  outline: 0;
  transition: background-color 300ms cubic-bezier(0.215, 0.61, 0.355, 1), color 300ms cubic-bezier(0.215, 0.61, 0.355, 1);
}

div.sp-pp .btn:focus,
div.sp-pp .btn:active,
div.sp-pp .btn:hover {
  background-color: #6EB1FF;
  color: white;
}

div.sp-pp .__first,
div.sp-pp .__second,
{
  animation-name: fadeIn;
  animation-duration: 180ms;
  animation-fill-mode: both;
  animation-iteration-count: 1;
}

div.sp-pp .__first {
  animation-delay: 0;
}

div.sp-pp .__second {
  animation-delay: 80ms;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translate3d(0, -25%, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}
!

JS
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