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HTML 

              
                <div class="area01">
    <div class="inner">
        <div class="qa_box">
        	<div class="qa_q">
        		<p class="q_txt">焼きそばは、何口食べていいですか？</p>
            	<div class="toggle_icon"></div>
            </div>
            <div class="qa_a">
              	<p class="a_txt">4口です。</p>
            </div>
        </div>
        <div class="qa_box">
            <div class="qa_q">
              <p class="q_txt">照り焼きチキンの取り置きはできますか？</p>
            <div class="toggle_icon"></div>
          </div>
            <div class="qa_a">
          <p class="a_txt">申し訳ございません。当店では、取り置き可能な商品は、ピスタチオのみとなっております。</p>
          </div>
        </div>
        <div class="qa_box">
            <div class="qa_q">
              <p class="q_txt">プリンはございますか？</p>
              <div class="toggle_icon"></div>
            </div>
            <div class="qa_a">
              <p class="a_txt">ございます。当店では、マルチビタミンプリン、ベリーピスタチオプリン、暗黒プリンの3種類を販売しています。<br>各プリンの個数は毎日10個限定の為、お早めにご来店ください。</p></div>
        </div>
        <div class="qa_box">
            <div class="qa_q">
              <p class="q_txt">タイムセールはありますか？</p>
              <div class="toggle_icon"></div>
              </div>
            <div class="qa_a">
              <p class="a_txt">不定期ですがございます。いつ頃かは明言できませんが、今までの傾向だと店長が奥さんとケンカした日は、16時～17時頃に突然、「仲直りしたいからタイムセールする！」と言い出します。</p>
            </div>
        </div>
    </div>
</div>
!

CSS 

              
                .area01{
    background-color: #fff;
}

.inner {
	width:750px;
	margin: 20px auto;
}

.qa_box{
    margin-bottom: 20px;
}

.qa_box .qa_q {
    background-color: #014897;
    border: 1px solid #014897;
    padding: 20px 25px;
    position: relative;
    cursor: pointer;
    color: #fff;
}

.toggle_icon {
  position: absolute;
  top: 50%;
  right: 2rem;
  width: 20px;
  height: 20px;
  margin-top: -15px;
}
.toggle_icon:before{
  position: absolute;
  content: "▼";
  margin: auto;
  box-sizing: border-box;
  vertical-align: middle;
}

.qa_q.open .toggle_icon:before{
    position: absolute;
    content: "ー";
    margin: auto;
    box-sizing: border-box;
    vertical-align: middle;
}

.qa_box .qa_a {
    display: none;
    padding: 25px 30px;
    border-left: 1px solid #ccc;
    border-right: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
    box-sizing: border-box;
    background: #fff;
}

.q_txt{
    display: block;
    padding-left: 35px;
    position: relative;
    line-height: 1.5;
    font-size: 20px;
}

.q_txt::before {
    position: absolute;
    left: 0;
    content: "Q．";
    color: #fff;
    font-size: 20px;
    font-weight: bold;
}

.a_txt {
    display: block;
    padding-left: 35px;
    position: relative;
    line-height: 1.5;
}

.a_txt::before {
    position: absolute;
    left: 0;
    content: "A．";
    color: #de0000;
    font-size: 20px;
    font-weight: bold;
}

@media screen and (max-width: 750px) { 
    .inner{
        width: auto;
    }
    
    .toggle_icon {
        right: 0.8rem;
    }
    
    .toggle_icon:before {
        width: 15px;
    }
    .toggle_icon:after {
        height: 15px;
        right: 7px;
    }
}

@media screen and (max-width: 480px) { 
    .toggle_icon {
        right: 0.4rem;
    }
}
!

JS 

              
                $(function(){
    $('.qa_q').click(function(){
        $(this).next().slideToggle();
        $(this).toggleClass("open");
  });
});
!
999px

Console