header {
    background: #ffffff;
    padding: 10px 0;
    height: 100px;
    padding: 25px 0;
    display: flex;
    justify-content: space-between;
    box-shadow: rgba(40, 48, 51, 0.2) 0px 2px 20px;
    z-index: 1000;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
}

header > a:first-child {
    width: 194px;
    height: 47px;
    margin-left: 130px;
    display: inline-block;
}

nav {
    display: inline-flex;
    flex-grow: 1;
    justify-content: flex-end;
    align-items: center;
}

nav > ul {
    display: flex;
    list-style: none;
    margin-right: 130px;
    justify-content: flex-end;
}

nav > ul > li {
    margin-left: 10px;
    font-size: 16px;
    color: #283033;
    cursor: pointer;
}

nav > ul > li > a {
    text-decoration: none;
    color: #27302a;
    padding: 20px 0;
}

nav > ul > li > a:hover {
    color: #006fff !important;
}

nav > ul > li > .dropdown {
    display: none;
    position: absolute;
    margin-top: 10px;
    padding: 10px 0;
    border-image: linear-gradient(to top, rgba(181, 176, 172, 0.4), rgba(0, 0, 0, 0)) 1 100%;
    border-top: none;
    background-color: #506eb9;
    outline-color: #fff;
    list-style: none;
}
/** downdown 左上角叫一个小三角 */
nav > ul > li > .dropdown::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 20px;
    transform: translateX(-50%);
    border: 10px solid transparent;
    border-bottom-color: #506eb9;
    border-top: none;
    z-index: 1000;
    outline-color: #fff;
}
nav > ul > li:hover .dropdown {
    display: block;
}
nav > ul > li:hover .icon {
    color: #006fff;
    transition: all 0.3s ease-in-out;
    transform: rotate(180deg);
    transform-origin: center;
}
nav > ul > li > .dropdown > li a {
    padding: 16px 14px;
    margin: 0px 10px;
    color: #fff;
    text-transform: none;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    font-weight: 500;
    font-size: 16px;
    letter-spacing: 0.5px;
    font-family: 'Lato', sans-serif;
    background: transparent;
    text-transform: capitalize;
    white-space: nowrap;
    text-decoration: none;
}