Tham khảo tài liệu 'xây dựng ứng dụng cho android với html, css và javascript - part 5', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Figure 2-6. Indenting text from the edges The content in the footer of this page is basically a rehash of the navigation element the ul element with the ID nav at the top of the page so you can remove the footer from the Android version of the page by setting the display to none as follows footer display none Adding the Android Look and Feel Time to get a little fancier. Starting from the top of the page add a 1-pixel white drop shadow to the header text and a CSS gradient to the background header hl a text-shadow 0px Ipx Ipx fff background-image -webkit-gradient linear left top left bottom from ccc to 999 Adding the Android Look and Feel 23 Download from In the text-shadow declaration the parameters from left to right are horizontal offset vertical offset blur and color. Most of the time you ll be applying the exact values shown here to your text because that s what usually looks good on Android but it is fun to experiment with text-shadow because it can add a subtle but sophisticated touch to your design. On most browsers it s fine to specify a blur radius of 0px. However Android requires you to specify a blur radius of at least 1px. If you specify a blur of 0 the text shadow will not show up on Android devices. The -webkit-gradient line deserves special attention. It s an instruction to the browser to generate a gradient image on the fly. Therefore you can use a CSS gradient anywhere you would normally specify a url . background image list style image . The parameters from left to right are as follows the gradient type can be linear or radial the starting point of the gradient can be left top left bottom right top or right bottom the end point of the gradient the starting color and the ending color. You cannot reverse the horizontal and vertical portions of the four gradient start and stop point constants . left top left bottom right top or right bottom . In other words top left bottom left top right and bottom right are invalid values. The
