#main_content {margin-bottom:3rem}

#main_content h2 {font-size:2.3rem; position: relative; margin: 2rem 1.5rem; font-weight: bold;display:flex;    align-items: center; }
#main_content h2  img {padding-right:.5rem; width:1.5rem}

#main_content ul {display:flex; flex-flow:column;}
#main_content ul li {margin: 0 1.5rem; margin-bottom: 1.5rem;}
#main_content ul li .qa_q {background: #fff; border: 1px solid #ccc; color:#333; font-size:2rem; line-height: 1.3; padding: 1.2rem;}
#main_content ul li .qa_q.on {background: #225a9b; color: #fff;}
#main_content ul li .qa_a {border:1px solid #ccc;color:#666; border-top: 0; display: none; font-size:1.8rem; line-height: 1.3; padding: 1.2rem;}
#main_content ul li .qa_a.on {display: block;}