How to change the text colour in search box widget to white?

Hi, I have used the following add Css but they don't work, could you help me please? The background colour on the search box is black with a white outline, I need to change the text to white so it's visible when searching. I'm using catch full screen free theme. input#s { color: #ffffff; } I found the following on an old topic on the forum and have added them but had no effect. #masthead input::-webkit-input-placeholder { color: #fff; } #masthead input:-moz-placeholder { color: #fff; } #masthead input:-ms-input-placeholder { color: #fff; } Thank you atousa