body{
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}
header ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: row;
    gap: 10px;
}
header ul li a{
    text-decoration: none;
    color:#999;
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: bold;
}
header{
    
    display: block;
    padding:20px;
    padding-right: 40px;
    border-radius:0px 0px 40px 0px;
    background: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: max-content;
    position:fixed;
    top: 0;
    left: 0;
    z-index: 1000;
}
header img{
    filter: brightness(0.8);
}
.logo{
    /*読み込みと同時にふわっと表示、よこはばを100％に*/
    animation: fadeIn 1s ease-in-out;
    height: auto;
    width: 100%;
}
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
@media (max-width: 600px) {
    header ul {
        flex-direction: column;
    }
    header ul li a {
        padding: 10px;
        text-align: center;
    }
}