#main_top{
    margin: 0 15%;
}

#main_top h1{
    margin-top: 70px;
    margin-bottom: 70px;
    text-align: center;
    font-size: 40px;
    letter-spacing: 0.2em;
    color: #273b62;
}

#main_top img{
    max-width: 100%;
}

#main_content{
    margin: 0 15%;
    margin-bottom: 80px;
}

#main_content h2{
    margin: 0 2%;
    margin-top: 10px;
    margin-bottom: 50px;
    padding: 5px 0 5px 15px;
    line-height: 1.5;
    letter-spacing: 0.3em;
    font-weight: 400;
    border-left: 6px solid #666;
}

#main_content h2 .main_h2{
    font-size: 23px;
}

#main_content .description{
    margin: 0 4%;
    margin-bottom: 30px;
    font-size: 14px;
    line-height: 2;
}

.container {
    display: flex;
    flex-wrap: wrap;
    max-width: 100%;
    min-height: auto;
    margin: 2em 0;
  }
  
.column_l {
    width: 74%;
    height: auto;
  }
.column_r {
    width: 24%;
    padding: 0 !important;

  }

@media only screen and (max-width:1200px){
/* YouTube用設定 開始 */
.column_l {
  width: 100%;
}
.column_r {
  width: 100%;
}
/* YouTube用設定 終了 */
}

@media only screen and (max-width:767px){
    #main_top{
        margin: 0;
    }
    
    #main_top h1{
        margin-top: 50px;
        margin-bottom: 50px;
        text-align: center;
        font-size: 24px;
        letter-spacing: 0.2em;
        color: #273b62;
    }

    #main_content{
        margin: 0 10%;
        margin-bottom: 20px;
    }

/* YouTube用設定 開始 */
      .column_l {
        width: 100%;
      }
      .column_r {
        width: 100%;
      }
/* YouTube用設定 終了 */
}