html - @media (max-width: 767px) { /*content*/} does not work -


so trying make webpage responsive , few days before found main css modification makes webpage responsive @media rule problem 

@media (min-width: 768px) , (max-width: 979px) {     .dropdown-content {       margin-left:10%  } }

this part of bootstrap-responsive.css refer tablet window version of webpage working fine. when switch mobile window version i.e. max-width :767px; html page not read it

@media (max-width: 767px) {   .dropdown:hover .dropdown-content {       display:none;  } }

this part of code not read in mobile window version. want utilize first css code above during tablet version , second css code above during mobile version. related js file or missing else? please me solution.

edit:- have changed attributes above , added html code down here

<li class="dropdown">     <a href="policies.php">policy</a>       <div class="dropdown-content">         <!--dropdown-content div-->       </div> </li>

by default attribute of dropdown-content 

 .dropdown-content{     display:none;     }

and when hover @ dropdown following code takes action

    .dropdown:hover .dropdown-content{         display:block;     }

whereas in mobile window version want hide again such hovering on dropdown not show dropdown-content

please add code sample html & css otherwise check out device size related media queries it's given below 

// small devices (portrait phones, less 576px)   @media (max-width: 575px) { ... }    // small devices (landscape phones, 576px , up)      @media (min-width: 576px) , (max-width: 767px) { ... }       // medium devices (tablets, 768px , up)        @media (min-width: 768px) , (max-width: 991px) { ... }        // large devices (desktops, 992px , up)         @media (min-width: 992px) , (max-width: 1199px) { ... }          // large devices (large desktops, 1200px , up)        @media (min-width: 1200px) { ... }

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