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HTML

            
              <form action="#login" class="Form">
  <h1 class="Form-title">Login</h1>
  <p class="Form-description">This form will allow you to login and validate with HTML5 + CSS.</p>
  <div class="Form-fields">
      <input type="email"
             id="email"
             class="ControlInput ControlInput--email"
             placeholder=" "
             required
      >
      <label for="email"
             class="Control-label Control-label--email"
      >Email</label>
      <div class="Control-requirements Control-requirements--email">
        Must be a valid email
      </div>

        <!-- this is here to give power to the :checked css selector -->
        <input type="checkbox"
               id="show-password"
               class="show-password"
        >
    
        <label for="show-password"
               class="Control-label Control-label--showPassword"
        >
          
          <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" width="32" height="32" class="svg-toggle-password" title="Toggle Password Security">
            <title>Hide/Show Password</title>
            <path d="M24,9A23.654,23.654,0,0,0,2,24a23.633,23.633,0,0,0,44,0A23.643,23.643,0,0,0,24,9Zm0,25A10,10,0,1,1,34,24,10,10,0,0,1,24,34Zm0-16a6,6,0,1,0,6,6A6,6,0,0,0,24,18Z"/>
              <rect x="20.133" y="2.117" height="44" transform="translate(23.536 -8.587) rotate(45)" class="closed-eye"/>
              <rect x="22" y="3.984" width="4" height="44" transform="translate(25.403 -9.36) rotate(45)" style="fill:#fff" class="closed-eye"/>
          </svg>
        </label>
    
        <input type="text"
               id="password"
               placeholder=" "
               autocomplete="off"
               autocapitalize="off"
               autocorrect="off"
               required
               pattern=".{6,}"
               class="ControlInput ControlInput--password"
        >

        <label for="password"
               class="Control-label Control-label--password"
        >Password</label>
    
        <div class="Control-requirements">
          Must contain at least 6 characters. We did this for your own sake.
        </div>
      
      
        <button type="submit" class="Button Form-submit">
          Login
          <svg width='26px' height='26px' xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="xMidYMid" class="Button-spinner">
              <rect x="0" y="0" width="100" height="100" fill="none" class="bk"></rect>
              <circle cx="50" cy="50" r="40" stroke="#fff" fill="none" stroke-width="18" stroke-linecap="round"></circle>
              <circle cx="50" cy="50" r="40" stroke="#e7542b" fill="none" stroke-width="9" stroke-linecap="round" class="spinner"></circle>
          </svg>
        </button>
    
    
  </div>
</form>
            
          
!

CSS

            
              .Form {
  width: 100%;
  max-width: 400px;
  margin: auto;
}

.Form-title {
  color: #00386a;
  margin: 0 0 15px;  
}

.Form-description {
  color: rgba(#6d6665, 50%) ;
}

.Form-fields {
  border-radius: 15px;
  border: 1px solid #c5c1c0;
  background-color: #fff;
  display: flex;
  flex-direction: column;
  padding: 24px 15px;
}

.Control-label {
  color: #423e3d;
  font-weight: bold;
  transition: color 300ms ease;
}

.Control-requirements {
  // display: none;
  background: pink;
  border-top: none;
  margin: -14px 0 15px;
  max-height: 0;
  overflow: hidden;
  transition: all 200ms ease;
  padding: 0 9px;
}

.ControlInput {
  border-radius: 3px;
  box-shadow: 0 1px 3px rgba(#c5c1c0, 0%) inset;
  color: #6d6665;
  margin: 0.8em 0;
  border: 1px solid #c5c1c0;
  padding: 0.6em 0.6em;
  transition: box-shadow 300ms ease-out;
  
  &:hover {
    box-shadow: 0 1px 3px rgba(#c5c1c0, 40%) inset;
  }
  
  &:focus {
    outline: #2bbee7 auto 3px;
  }
  // only show the invalid input if we aren't focusing on the element
  // and there is no placeholder
  &:invalid:not(:focus):not(:placeholder-shown) {
    border-color: red;
    border-bottom: none;
    // box-shadow: 0 1px 3px rgba(#f00, 3%) inset;
      
    & + .Control-label {
      color: red;
      
       & + .Control-requirements {
        // display: block;
        max-height: 100px;
        padding: 9px;
        border: 1px solid red;
      }   
    }

  }
  
  &:valid:not(:focus):not(:placeholder-shown) {
    border-color: #5fa550;
    & + .Control-label {
      color: #5fa550;
    }
  }
  

}

.Control-requirements--email,
.ControlInput--email {
  order: -1;
}

.Control-label--email {
  order: -2;
}

.ControlInput--password {
  order: 0;
  padding-right: 50px;
}

.Control-label--password {
  order: -1;
  margin-bottom: -32px; // pull up the offset of the hide password button
}
.Control-label--showPassword {
  width: 32px;
  position: relative;
  top: 52px;
  left: 100%;
  text-align: right;
  margin-left: -36px;
  
}

.Form-submit {
  border: 1px solid #e7542b;
  background-color: #e7542b;
  border-radius: 3px;
  color: #fff;
  display: block;
  width: 100%;
  max-width: 100%;
  pointer-events: none;
  opacity: 0.6;
  cursor: default;
  transition: opacity 300ms ease-out, max-width 150ms ease-out;
  outline: none;
  position: relative;
  margin: auto;
  
  &:hover {
    background-color: darken(#e7542b, 10%);
  }
  &:active {
    background-color: darken(#e7542b, 20%);
    max-width: 50px;
    overflow: hidden;
    text-indent: 300px;
    
    .Button-spinner {
      opacity: 1;
    }
  }

  .ControlInput--email:valid ~ .ControlInput--password:valid ~ & {
    cursor: pointer;
    pointer-events: auto;
    opacity: 1;
  }
}

//SVG
.Button-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -13px;
  margin-top: -13px;
  opacity: 0;
}
// show password checkbox hack
.show-password {
  display: none;
  
  &:checked {
    // background: purple;
    
    & ~ .ControlInput--password {
      text-security: disc;
      -webkit-text-security: disc;
      -moz-text-security: disc; // doesn't work :'|
    }
    
    & ~ .Control-label--showPassword {
      .svg-toggle-password {
        
        .closed-eye {
          opacity: 1;
          transition: opacity 300ms ease, height 400ms ease;
          width: 4px;
          height: 44px;
        }
      }
    }
  }
}
// default eye position
.svg-toggle-password {
  fill: rgba(#008ed6, 50%);
  
  .closed-eye {
    opacity: 0;
    height: 0;
  }
}

.Button {
  padding: 10px;
  user-select: none;
}


.spinner {
  animation: dash 2s linear infinite;
  animation-direction: normal;
}

@keyframes dash {
  0% {
    stroke-dashoffset: 0;
    stroke-dasharray: 150.6 100.4;
  }
  50% {
    stroke-dasharray: 1 250;
  }
  100% {
    stroke-dashoffset: 502;
    stroke-dasharray: 150.6 100.4;
  }
}

@keyframes spinner-in {
  0% {
    opacity: 0;
  }
  20%, 80% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}


html {
  box-sizing: border-box;
  height: 100%;
}

body {
  background-color: #f1f2f1;
  background-image: linear-gradient(#e7e8e7, #f1f2f1);
  display: flex;  
  min-height: 100%;
}

*, *:before, *:after {
  box-sizing: inherit;
}
            
          
!

JS

            
              // CSS Only Concept.
// Please note I wouldn't call this "production" code use at your own risk.
//
// A few sibling selectors + checkbox hacks + a CSS property `text-security: disc;` I didn't previously know about
//
// Note the password secruit
//
//https://css-tricks.com/form-validation-ux-html-css/
            
          
!
999px

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