#main_content {}

#main_content h2 {font-size:3rem; position: relative; margin: 2rem 1.5rem 1rem; font-weight: 600; display:flex; align-items: center; color: #28aa7f;}
#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 1rem;}
#main_content ul li .qa_q {background: #fff; border: 1px solid #ddd; color:#333; font-size:2rem; line-height: 1.4; padding: 1.2rem; font-weight: 600;}
#main_content ul li.on .qa_q {background: #d4ece4;color: #269688;}
#main_content ul li .qa_a {border:1px solid #ddd;color:#7f7f7f; border-top: 0; display: none; font-size:1.8rem; line-height: 1.6; padding: 1.2rem;}
#main_content ul li.on .qa_a {display: block;}