html{
    overflow-x: hidden;
}
body {
    background-image: url('../images/sky.png'); /* 背景画像を指定 */
    background-size: cover;                     /* 背景画像を全体に拡大 */
    background-repeat: no-repeat;               /* 画像を繰り返さない */
    background-position: center;                /* 画像を中央に配置 */
    margin: 0;
    padding: 0;
}
header nav ul{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    display: flex;
    text-align: center;
    justify-content: space-around;
    background-color: rgb(22, 174, 22);
    align-items: center;
    z-index: 100;
    margin: 0;
    padding: 0;
}
header nav ul li{
    list-style-type: none;
}
header nav ul li a{
    color: #ffffff;
    text-decoration: none;
}
header nav ul li a:hover{
    color: blue;
    text-decoration: underline;
}
body article{
    width: 100%;
    margin-top: 70px;
    padding: 20px;
    text-align: center;
}
body .profile img{
    width: 300px;
    height: 300px;
    border-radius: 20%;
    object-fit: cover;
    padding: 0 20px;
}
body .social-media img{
    width: 300px;
    height: 300px;
    border-radius: 20%;
    object-fit: cover;
}
body article p{
    font-size: 24px;
}
.divider{
    width: 100%;
    display: block;
    border-bottom: 3px solid #ffffff;
    margin: 0 auto;
}
.social-media{
    width: 100%;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    margin: 0 auto;
}
.social-media a{
    text-decoration: none;
    color: black;
}
.social-media a:hover{
    color: blue;
    text-decoration: underline;
}
.skills-table{
    font-size: 18px;
    width: 90%;
    border-collapse: collapse;
    margin: 20px auto;
}
.skills-table th, .skills-table td{
    border: 3px solid #ffffff;
    padding: 10px;
}
.tool{
    font-size: 18px;
    width: 90%;
    border-collapse: collapse;
    margin: 20px auto;
}
.tool th, .tool td{
    border: 3px solid #ffffff;
    padding: 10px;
}
.project-table{
    font-size: 18px;
    width: 90%;
    border-collapse: collapse;
    margin: 20px;
}
.project-table th, .project-table td{
    border: 3px solid #ffffff;
    padding: 10px;
}
.project-list a{
    text-decoration: none;
    color: orange;
}
.project-list a:hover{
    color: blue;
    text-decoration: underline;
}
.project-image{
    width: 100%;
    height: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 20%;
    object-fit: cover;
}
footer{
    width: 100%;
    height: 100%;
    text-align: center;
    padding: 10px;
    margin: 0;
    background-color: rgb(22, 174, 22);
    color: #ffffff;
    box-sizing: border-box;
}