ul.flex_nav {
    display: flex;
    justify-content: center;
}
nav a {
    color: inherit; /* 移除超連結顏色 */
    display: block; /* 讓 <a> 填滿 <li> */
    font-size: 1.2rem;
    padding: 10px;
    text-decoration: none;  /* 移除超連結底線 */
}
nav ul {
    list-style: none;   /* 移除項目符號 */
    background-color: #F0E68C;
    padding: 0;
    margin: 0;
    
}
nav a:hover {
    background-color: gray;
    color: white;
}

ul.flex_nav ul {
border: #ccc 1px solid;
position: absolute;
z-index: 99;
left: -1px;
top: 100%;
width:fit-content;
}

ul.flex_nav ul li {
border-bottom: #ccc 1px solid;
}


ul.flex_nav ul { /*隱藏次選單*/
display: none;
}

ul.flex_nav li:hover > ul { /* 滑鼠滑入展開次選單*/
display: block;
}
ul.flex_nav li {
position: relative;
white-space: nowrap;
border-right: #ccc 1px solid;
}




.fb_like {
    display:flex; 
    flex-wrap:wrap; 
    flex-direction: row; 
    max-width: 950px;
    position: relative;
    margin: auto;
    margin-top: 30px;
    margin-bottom:-30px;
    padding: 15px;
    justify-content: space-around; 
    align-content: space-around;
    background-color:#8BCC66;
}