Ionic transparent navbar header bar-- how to achieve it

how to achieve this transparent nav bar effect in ionic using css or sass

You only need to Google it a bit:

Hi i have seen it but how do i get the image under the bar , and also
followed your instruction , but it cause the android app to disable/cease scrolling , but ios is fine
here is the css
` {
background: rgba(0,0,0,.30);
border-bottom-width: 0;
} h1 {
color: black !important;

.scroll-content {
overflow: visible !important;

.platform-ios.platform-cordova:not(.fullscreen) .has-header {
}/* Empty. Add your own CSS if you like */