.header {
    height: 50px;
    position: sticky;
    display: flex;
    top: 0;
    justify-content: space-between;
    /* 子要素を左右に配置 */
    background-color: #333;
    color: white;
    padding: 5px 40px;
    align-items: center;
    z-index: 1000;
    /* 他のコンテンツよりも上に表示 */
}


.header .welcome {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 16px;
    /* 文字サイズ調整 */
}
.header img{
    width: 50px;
    height: 50px;
    padding: 0px 10px 0px 0px;
}

.header .button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    border-radius: 25px;

}