<div class="container">
  <details class="default square">
    <summary>Click to <span class="open">open</span><span class="close">close</span></summary>
    <p>If your browser supports this element, it should allow you to expand and collapse these details.</p>
  </details>
  <details class="primary square">
    <summary>Click to <span class="open">open</span><span class="close">close</span></summary>    <p>If your browser supports this element, it should allow you to expand and collapse these details.</p>
  </details>
  <details class="success">
    <summary>Click to <span class="open">open</span><span class="close">close</span></summary>    <p>If your browser supports this element, it should allow you to expand and collapse these details.</p>
  </details>
</div>

// Colors
$default: #878d99;
$primary: #409eff;
$sucess: #67c23a;

// Some Reset
html,
body {
  width: 100%;
  height: 100%;
  padding: 0;
  overflow: hidden;
  font-family: "Open Sans", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  width: 450px;
  height: 376px;
}

// Change component color
@mixin states($color: $default) {
  border-color: $color;
  color: rgba(255, 255, 255, 0.9);
  background: $color;

  &:hover {
    border-color: $color;
    color: rgba(255, 255, 255, 0.6);
  }
  &:active {
    color: rgba(255, 255, 255, 0.9);
    border-color: darken($color, 10%);
  }
}

// Collapse / Expand Component
details {
  @include states($default);
  border: 1px solid;
  cursor: pointer;
  transition: background 0.3s;
  border-radius: 4px;
  min-height: 48px;
  max-height: 60px;
  transform-origin: top center;
  transform: rotate(0.1deg);
  transition: all 0.3s;

  ::-webkit-details-marker {
    display: none;
  }

  + details {
    margin-top: 10px;
  }

  p {
    color: #fefefe;
    line-height: 1.7;
    margin: 10px 0 0;
    padding: 0 20px 15px;
  }

  // Primary Style
  &.primary {
    @include states($primary);
  }

  // Success Style
  &.success {
    @include states($sucess);
  }

  // Square Style
  &.square {
    border-radius: 0;
  }

  &[open] {
    transition: all 0.6s;
    min-height: 100px;
    max-height: 200px;
  }
}

summary {
  outline: none;
  font-size: 16px;
  padding: 13px;
  
  &:selection {
    background: transparent;
  }


  .close {
    display: none;
    
    [open] & {
      display: inline;
    }
  }

  .open {
    display: inline;

    [open] & {
      display: none;
    }
  }

  [open] & {
    display: inline;
  }

  &:after {
    margin-top: 2px;
    content: "➕";
    float: left;
    margin-right: 11px;
    text-align: center;
    font-size: 11px;
    
    [open] & {
      padding: 0 0 12px 0;
      content: "➖";
    }
  }
}