Hello,

Please add these lines into your custom css box:

.archive .page_header_yes .top_wrapper {
    padding-top: 100px;
}
.archive #header {
    background-color: #5899D2;
}

Edit the color to your wish. Result.

Best regards!

Hello,

1-Please add this code:

.page_header_yes #content {
    padding-top: 100px !important;
}

for more space between the first article and header.
2-I can see the light logo in mobile, screenshot. Did you manage to change it?

Best regards!