Thank you so much! Here's the full code I ended up using:
#header {
background-color: transparent;
}
.header-announcement-bar-wrapper {
background-color: rgba(0,0,0,0)!important;
-webkit-backdrop-filter: blur(0px);
backdrop-filter: blur(0px);
}
.tweak-fixed-header .shrink.header {
background: #c7faeb !important;
}
.tweak-fixed-header .shrink.header .header-nav-wrapper a {
color: #000 !important;
}