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HTML

CSS

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HTML

              
                <link href='https://fonts.googleapis.com/css?family=Open+Sans:400,300,700' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Sofia' rel='stylesheet' type='text/css'>

.login
  %h2 Acceso
  %input{:name => "user", :placeholder => "Username", :type => "text"}
  %input#pw{:name => "password", :placeholder => "Password", :type => "password"}
    %input{:type => "submit",:class => "animated", :value => "Entrar"}


  
              
            
!

CSS

              
                @import compass

*
  margin: 0
  padding: 0

body
  background: #2E3740
  color: #435160
  font-family: 'Open Sans', sans-serif

h2
  color: #6D7781
  font-family: 'Sofia', cursive
  font-size: 15px
  font-weight: bold
  font-size: 3.6em
  text-align: center
  margin-bottom: 20px

a
  color: #435160
  text-decoration: none

.login
  width: 350px
  position: absolute
  top: 10%
  left: 50%
  margin-left: -175px

input
  &[type="text"], &[type="password"]
    width: 350px
    padding: 20px 0px
    background: transparent
    border: 0
    border-bottom: 1px solid #435160
    outline: none
    color: #6D7781
    font-size: 16px
  &[type=checkbox]
    display: none

label
  display: block
  position: absolute
  margin-right: 10px
  width: 8px
  height: 8px
  border-radius: 50%
  background: transparent
  content: ""
  transition: all .3s ease-in-out
  cursor: pointer
  border: 3px solid #435160

#agree:checked ~ label[for=agree]
  background: #435160

input[type="submit"]
  background: #1FCE6D
  border: 0
  width: 350px
  height: 40px
  border-radius: 3px
  color: #fff
  font-size: 12px
  cursor: pointer
  transition: background .3s ease-in-out
  &:hover
    background: #16aa56
    animation-name: shake

.forgot
  margin-top: 30px
  display: block
  font-size: 11px
  text-align: center
  font-weight: bold
  &:hover
    margin-top: 30px
    display: block
    font-size: 11px
    text-align: center
    font-weight: bold
    color: #6D7781

.agree
  padding: 30px 0px
  font-size: 12px
  text-indent: 25px
  line-height: 15px

::-webkit-input-placeholder
  color: #435160
  font-size: 12px

.animated
  animation-fill-mode: both
  animation-duration: 1s

@keyframes shake
  0%, 100%
    transform: translateX(0)
  10%, 30%, 50%, 70%, 90%
    transform: translateX(-10px)
  20%, 40%, 60%, 80%
    transform: translateX(10px)

              
            
!

JS

              
                /* 
  Based on Andreas Storm work
  URL: https://codepen.io/andreasstorm/pen/duBpt
*/
              
            
!
999px

Console