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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              mixin subscribe-form
  form.subscribe-form
    input.subscribe-form__input(type='email' title="Email" placeholder="Email")
    +button: | Subscribe

mixin button
  button.button&attributes(attributes)
    block

mixin sidebar
  .sidebar&attributes(attributes)
    +subscribe-form

.site-container
  .main
  +sidebar

            
          
!

CSS

            
              /* site-container component file */
.site-container {
  display: grid;
  //IE doesn't support grid-gap
  grid-template-columns: 1fr 10px 300px;

  // context sensitive sidebar placement
  .sidebar {
    grid-column: 3;
  }
}

/* main component file */
.main {
  border: 1px dotted green;
}

/* sidebar component file */
.sidebar {

  // subscribe-form styles that only
  // apply when it is in the sidebar
  .subscribe-form {
    display: block;

    &__input {
      display: block;
      width: 100%;
      margin-bottom: 10px;
    }

    // Button styles that only apply
    // when it is both in the side bar
    // AND in the subscribe form
    .button {
      width: 100%;
    }
  }
}

/* subscribe-form component file */
.subscribe-form {
  display: grid;
  //Can't use grid-gap due to IE11 support
  grid-template-columns: 1fr 10px auto;
  border: 1px dotted #000;
  padding: 10px;

  &__input {
    border: 1px solid #000;
    padding: 10px;
  }

  // styling that only applies when the
  // button is in the subscribe form
  .button {
    grid-column: 3;
  }
}

/* button component file */
.button {
  /* styles that we want to appear on every button by default */
  padding: 10px;
  background: darkgreen;
  color: #fff;
  border: 0;
  text-decoration: none;
  text-align: center;
  display: inline-block;
}

/* resets file */
* {
  box-sizing: border-box;
}
            
          
!

JS

            
              
            
          
!
999px

Console