header {
    position: fixed;
    top: 0;
    left: 0;
    padding: 10px;
    width: 100%;
    background: #fff;
    border-bottom: 1px solid #e7e7e7;
    box-sizing: border-box;
    z-index: 100;
}

header div {
    display: flex;
    justify-content: space-between;
    margin: 0 auto;
    max-width: 1000px;
}

header img:nth-child(1) {
    width: 80px;
}

header img:nth-child(2) {
    width: 35px;
}