HTML

CSS

JS

<div class="container">
  <h2>Frequently Asked Questions</h2>
  <div class="faq-accordion">
    <div class="faq-accordion-item">
      <button id="accordion-button-1" aria-expanded="false">
        <span class="faq-accordion-question">Why use accordion for FAQs</span>
        <span class="icon" aria-hidden="true"></span>
      </button>
      <div class="faq-accordion-answer">
        <p>An accordion is best for showing content that are expanded and collapsed.</p>
      </div>
    </div>
    <div class="faq-accordion-item">
      <button id="accordion-button-2" aria-expanded="false">
        <span class="faq-accordion-question">Should accordion default to expanded?</span>
        <span class="icon" aria-hidden="true"></span>
      </button>
      <div class="faq-accordion-answer">
        <p>This is entirely up to your design.</p>
      </div>
    </div>
    <div class="faq-accordion-item">
      <button id="accordion-button-3" aria-expanded="false">
        <span class="faq-accordion-question">Is this UI element free?</span>
        <span class="icon" aria-hidden="true"></span>
      </button>
      <div class="faq-accordion-answer">
        <p>Yes it is, open source, MIT, and free.</p>
      </div>
    </div>
  </div>
</div>

body{
    background: #fff;
    color: #4d5974;
    padding: 10px;
}

h2 {
    text-align: center;
}

.faq-accordion .faq-accordion-item {
  border-bottom: 1px solid #e5e5e5;
}

.faq-accordion .faq-accordion-item button[aria-expanded=true] {
  border-bottom: 1px solid #03b5d2;
}

.faq-accordion button {
  position: relative;
  display: block;
  text-align: left;
  width: 100%;
  padding: 1em 0;
  color: #7288a2;
  font-size: 1.15rem;
  font-weight: 400;
  border: none;
  background: none;
  outline: none;
}

.faq-accordion button:hover, .faq-accordion button:focus {
  cursor: pointer;
  color: #03b5d2;
}

.faq-accordion button:hover::after, .faq-accordion button:focus::after {
  cursor: pointer;
  color: #03b5d2;
  border: 1px solid #03b5d2;
}

.faq-accordion button .faq-accordion-question {
  padding: 1em 1.5em 1em 0;
}

.faq-accordion button .icon {
  display: inline-block;
  position: absolute;
  top: 18px;
  right: 0;
  width: 22px;
  height: 22px;
  border: 1px solid;
  border-radius: 22px;
}

.faq-accordion button .icon::before {
  display: block;
  position: absolute;
  content: "";
  top: 9px;
  left: 5px;
  width: 10px;
  height: 2px;
  background: currentColor;
}

.faq-accordion button .icon::after {
  display: block;
  position: absolute;
  content: "";
  top: 5px;
  left: 9px;
  width: 2px;
  height: 10px;
  background: currentColor;
}

.faq-accordion button[aria-expanded=true] {
  color: #03b5d2;
}

.faq-accordion button[aria-expanded=true] .icon::after {
  width: 0;
}

.faq-accordion button[aria-expanded=true] + .faq-accordion-answer {
  opacity: 1;
  max-height: 9em;
  transition: all 200ms linear;
  will-change: opacity, max-height;
}

.faq-accordion .faq-accordion-answer {
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 200ms linear, max-height 200ms linear;
  will-change: opacity, max-height;
}

.faq-accordion .faq-accordion-answer p {
  font-size: 1rem;
  font-weight: 300;
  margin: 2em 0;
}

Frequently Asked Questions Using Accordion

Frequently Asked Questions is built with accordion elements and a little vanilla JavaScript. This element has a standard format for FAQs, which is great if you are not looking for anything fancy with animations.