.topnav {
    background-color: #333;
    height: 50px;
    overflow: hidden;
  }
  
  /* 繝｡繝九Η繝ｼ繧｢繧､繝�Β縺ｮ繧ｹ繧ｿ繧､繝ｫ繧定ｨｭ螳� */
  .topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 0px 20px 0px 20px;
    text-decoration: none;
    font-size: 17px;
    line-height: 50px;
    transition: all 0.3s ease-in-out; /* 繧｢繝九Γ繝ｼ繧ｷ繝ｧ繝ｳ縺ｮ蜉ｹ譫懊→譎る俣繧定ｨｭ螳� */
  }
  
  /* 繝｡繝九Η繝ｼ繧｢繧､繝�Β縺ｫ繝槭え繧ｹ繧ｪ繝ｼ繝舌�縺励◆縺ｨ縺阪�繧ｹ繧ｿ繧､繝ｫ繧定ｨｭ螳� */
  .topnav a:hover {
    background-color: #ddd;
    color: black;
    transform: scale(1.1); /* 繧｢繧､繝�Β繧貞ｰ代＠螟ｧ縺阪￥縺吶ｋ */
  }
  
  /* 繧｢繧ｯ繝�ぅ繝悶↑繝｡繝九Η繝ｼ繧｢繧､繝�Β縺ｮ繧ｹ繧ｿ繧､繝ｫ繧定ｨｭ螳� */
  .topnav a.active {
    background-color: #006ab1;
    color: white;
  }