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<div class="signup">
  <div class="signup-connect">
    <h1>Create your account</h1>
    <a href="#" class="btn btn-social btn-facebook"><i class="fa fa-facebook"></i> Sign in with Facebook</a>
    <a href="#" class="btn btn-social btn-twitter"><i class="fa fa-twitter"></i> Sign in with Twitter</a>
    <a href="#" class="btn btn-social btn-google"><i class="fa fa-google"></i> Sign in with Google</a>
    <a href="#" class="btn btn-social btn-linkedin"><i class="fa fa-linkedin"></i> Sign in with Linkedin</a>
  </div>
  <div class="signup-classic">
    <h2>Or use the classical way</h2>
    <form class="form">
      <fieldset class="username">
        <input type="text" placeholder="username" />
      </fieldset>
      <fieldset class="email">
        <input type="email" placeholder="email" />
      </fieldset>
      <fieldset class="password">
        <input type="password" placeholder="password" />
      </fieldset>
      <button type="submit" class="btn">sign up</button>
    </form>
  </div>
</div>

*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
  font-family: Open Sans;
}
body {
  background: hsl(86, 85%, 95%);
}


/*--------------------
Buttons
--------------------*/
.btn {
  display: block;
  background: hsl(86, 76%, 71%);
  color: hsl(0, 0, 100);
  text-decoration: none;
  margin: 20px 0;
  padding: 15px 15px;
  border-radius: 5px;
  position: relative;
  
  &::after {
    content: '';
    position: absolute;
    z-index: 1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: all .2s ease-in-out;
    box-shadow: inset 0 3px 0 hsla(0, 0, 0, 0), 0 3px 3px hsla(0, 0, 0, .2);
    border-radius: 5px;
  }
  
  &:hover::after {
    background: hsla(0, 0, 0, 0.1);
    box-shadow: inset 0 3px 0 hsla(0, 0, 0, 0.2);
  }
  
} 
.btn-social {
  padding-left: 64px;
  position: relative;
  z-index: 1;
  
  .fa {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    width: 50px;
    height: 100%;
    text-align: center;
    background: hsla(0, 0, 0, 0.1);
    line-height: 3.2;
    border-radius: 5px 0 0 5px;
  }
  
}
.btn-facebook {
  background-color: hsl(221, 44%, 41%);
}
.btn-twitter {
  background-color: hsl(206, 82%, 63%);
}
.btn-google {
  background-color: hsl(7, 71%, 55%); 
}
.btn-linkedin {
  background-color: hsl(196, 100%, 43%);
}


/*--------------------
Form
--------------------*/
.form {
  
  fieldset {
    border: none;
    padding: 0;
    margin: 20px 0;
    position: relative;
    
    input {
      width: 100%;
      height: 48px;
      color: hsl(0, 0, 20);
      padding: 15px 40px 15px 15px;
      border-radius: 5px;
      font-size: 14px;
      outline: none!important;
      border: 1px solid hsla(0, 0, 0, 0.3);
      box-shadow: inset 0 1px 4px hsla(0, 0, 0, 0.2);
      vertical-align: top;
    }
     
  }
  
  button {
    width: 100%;
    outline: none!important;
    background: linear-gradient(-5deg, hsl(86, 61%, 44%), hsl(86, 65%, 54%));
    border: none;
    text-transform: uppercase;
    font-weight: bold;
    box-shadow: 0 3px 0px hsla(86, 21%, 44%, 0.2);
    text-shadow: 0 2px 3px hsla(0, 0, 0, 0.2);
  }
  
}



/*--------------------
Signup
--------------------*/
.signup {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  width: 800px;
  background: hsl(0, 0, 100);
  border-radius: 10px;
  box-shadow: 0 3px 25px hsla(0, 0, 0, 0.2);
  overflow: hidden;
  display: flex;
}

.signup-connect,
.signup-classic
{
  width: 50%;
  padding: 30px 50px;
}

.signup-connect {
  background: linear-gradient(134deg, hsl(44, 96%, 65%), hsl(34, 95%, 45%));
  color: hsl(0, 0, 100);
  
  h1 {
    font-size: 30px;
    margin-top: 10px;
    margin-bottom: 40px;
    text-shadow: 0 2px 3px hsla(0, 0, 0, 0.1);
  }
  
}

.signup-classic {
  
  h2 {
    font-size: 16px;
    font-weight: normal;
    margin-top: 23px;
    margin-bottom: 43px;
    text-shadow: 0 2px 3px hsla(0, 0, 0, 0.1);
  }
  
  fieldset::after {
    content: '\f007';
    font-family: FontAwesome;
    position: absolute;
    right: 15px;
    top: 17px;
    z-index: 2;
    width: 20px;
    color: hsla(0, 0, 0, .2);
    text-align: center;
  }
  
  fieldset.email::after {
    content: '\f0e0';
  }
  
  fieldset.password::after {
    content: '\f023';
  }
  
}