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CSS

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HTML 

              
                <div class="button">
  <button><span>Click Me</span></button>
</div>

<div class="pop-up">
  <div class="content">
    <div class="container">
      <div class="dots">
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
      </div>
      
      <span class="close">close</span>
      
      <div class="title">
        <h1>subscribe</h1>
      </div>
      
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/256492/cXsiNryL.png" alt="Car">
      
      <div class="subscribe">
        <h1>Subscribe to get the latest <span>news &amp; updates</span>.</h1>
      
        <form>
          <input type="email" placeholder="Your email address">
          <input type="submit" value="Subscribe">
        </form>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                /* COLORS
========================================== */

$gray: #3e4146;
$blue: #689bf6;
$yellow: #ffd84c;
$orange: #f66867;
$purple: #8e6ac1;
$white: #ffffff;
$black: #000000;

/* MIXINS
========================================== */

@mixin animation($animation) {
  -webkit-animation: #{$animation};
     -moz-animation: #{$animation};
       -o-animation: #{$animation};
          animation: #{$animation};
}

@mixin animation-delay($animation-delay) {
  -webkit-transition-delay: #{$animation-delay};
     -moz-transition-delay: #{$animation-delay};
       -o-transition-delay: #{$animation-delay};
          transition-delay: #{$animation-delay};
}

@mixin keyframes($keyframes) {
  @-webkit-keyframes #{$keyframes} { @content; }
     @-moz-keyframes #{$keyframes} { @content; }
       @-o-keyframes #{$keyframes} { @content; }
          @keyframes #{$keyframes} { @content; }
}

@mixin transform($transform) {
  -webkit-transform: $transform;
     -moz-transform: $transform;
      -ms-transform: $transform;
       -o-transform: $transform;
          transform: $transform;
}

@mixin transition($transition) {
  -webkit-transition: #{$transition};
     -moz-transition: #{$transition};
       -o-transition: #{$transition};
          transition: #{$transition};
}

@mixin transition-delay($transition-delay) {
  -webkit-transition-delay: #{$transition-delay};
     -moz-transition-delay: #{$transition-delay};
       -o-transition-delay: #{$transition-delay};
          transition-delay: #{$transition-delay};
}

/* KEYFRAMES
========================================== */

@include keyframes(float) {
  0% {
		transform: translatey(0px);
    transform: translatex(0px);
	}
	50% {
		transform: translatey(-30px);
    transform: translatex(20px);
	}
	100% {
		transform: translatey(0px);
    transform: translatex(0px);
	}
}

/* RESET
========================================== */

*, *:before, *:after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: $gray;
  font-family: 'Roboto Condensed', sans-serif;
}

/* BUTTON
========================================== */

.button {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  
  button {
    position: absolute;
    top: 50%;
    left: 50%;
    @include transform(translate(-50%, -50%));
    
    font-family: inherit;
    background-color: $white;
    border: 0;
    padding: 15px 25px;
    color: $black;
    text-transform: uppercase;
    font-size: 21px;
    letter-spacing: 1px;
    width: 200px;
    overflow: hidden;
    outline: 0;
    @include transition(all .4s);
    visibility: visible;
    opacity: 1;
    font-weight: bold;
    box-shadow: 0px 6px 30px rgba(0,0,0,0.6);
    
    &:hover {
      cursor: pointer;
      background-color: $purple;
      color: $white;
    }
    
    span {
      
      opacity: 1;
    }
  }
  
  &.clicked {
    button {
      visibility: hidden;
      oacity: 0;
    }
  }
}

/* POP-UP
========================================== */

.pop-up {
  position: absolute;
  top: 50%;
  left: 50%;
  @include transform(translate(-50%, -50%) scale(0.9));
  overflow-y: auto; 
  box-shadow: 0px 6px 30px rgba(0,0,0,0.4);
  visibility: hidden;
  opacity: 0;
  @include transition(all .3s);
  z-index: 10;
  background-color: $white;
  width: 100%;
  height: 100%;
  
  @media (min-width: 768px) {
    width: calc(100% - 40px);
    height: auto;
    max-width: 900px;
  }
  
  .content {
    width: 100%;
    max-width: 900px;
    overflow: hidden;
    text-align: center;
    position: relative;
    min-height: 100vh;
    
    @media (min-width: 768px) {
      min-height: inherit;
    }
    
    .container {
      padding: 100px 20px 140px;
      
      @media (min-width: 568px) {
        padding: 50px 20px 80px;
      }
      
      @media (min-width: 768px) {
        padding: 70px 0px 90px;
        max-width: 520px;
        margin: 0 auto;
      }
    }
    
    .close {
      position: absolute;
      top: 20px;
      left: 20px;
      font-size: 1.1rem;
      letter-spacing: 0.05rem;
      color: $gray;
      @include transition(all .4s);
      
      &:hover {
        cursor: pointer;
        color: $orange;
      }
    }
    
    .dots {
      .dot {
        position: absolute;
        border-radius: 100%;
        z-index: 11;
        
        &:nth-of-type(1) {
          top: -80px;
          right: -80px;
          width: 160px;
          height: 160px;
          background-color: $blue;
          @include animation(float 6s ease-in-out infinite);
          
          @media (min-width: 768px) {
            top: -190px;
            right: -190px;
            width: 380px;
            height: 380px;
          }
        }
        
        &:nth-of-type(2) {
          bottom: -120px;
          left: -120px;
          width: 240px;
          height: 240px;
          background-color: $orange;
          @include animation(float 8s ease-in-out infinite);
        }
        
        &:nth-of-type(3) {
          bottom: -50px;
          right: -50px;
          width: 100px;
          height: 100px;
          background-color: $yellow;
          @include animation(float 4s ease-in-out infinite);
        }
      }
    }
    
    .title {
      h1 {
        text-align: center;
        color: $orange;
        text-transform: uppercase;
        font-weight: 900;
        font-size: 2.8rem; //1.4
        letter-spacing: 0.05rem;
      }
    }
    
    img {
      width: 100%;
      max-width: 220px;
      display: inline-block;
      margin: 30px 0 40px 0;
      opacity: 0;
      @include transform(translateX(60px));
      @include transition(.2s);
      -webkit-backface-visibility: hidden;
      
      @media (min-width: 768px) {
        max-width: 300px;
      }
    }
    
    .subscribe {
      h1 {
        font-size: 1.5rem;
        color: $gray;
        line-height: 130%;
        letter-spacing: 0.07rem;
        margin-bottom: 30px;
        
        span {
          color: $orange;
        }
      }
      
      form {
        overflow: hidden;
        
        input {
          width: 100%;
          float: left;
          padding: 15px 20px;
          text-align: center;
          font-family: inherit;
          font-size: 1.1rem;
          letter-spacing: 0.05rem;
          outline: 0;
          
          &[type=email] {
            margin-bottom: 15px;
            border: 1px solid lighten($gray, 50%);
            @include transition(all .4s);
            
            @media (min-width: 768px) {
              margin-bottom: 0px;
              width: 75%;
              border-right-width: 0px;
            }
            
            &:focus {
              border-color: $gray;
            }
          }
          
          &[type=submit] {
            background-color: $purple;
            color: $white;
            border: 1px solid $purple;
            @include transition(all .4s);
            
            @media (min-width: 768px) {
              width: 25%;
            }
            
            &:hover {
              cursor: pointer;
              background-color: darken($purple, 10%);
              border-color: darken($purple, 10%);
            }
          }
        }
      }
    }
  }
  
  &.open {
    visibility: visible;
    opacity: 1;
    @include transform(translate(-50%, -50%) scale(1));
    
    img {
      opacity: 1;
      @include transition(1s);
      @include transition-delay(.3s);
      @include transform(translateX(0px));
    }
  }
}
!

JS 

              
                $('button').click(function(){
  $('.pop-up').addClass('open');
});

$('.pop-up .close').click(function(){
  $('.pop-up').removeClass('open');
});
!
999px

Console