.knopka{
    border:1px solid transparent;
    font-size:1.2em;
    border-color:#C7C3BF;
    color:#497e69;
    text-decoration:none;
    user-select:none
    ;background:rgb(212,75,56);
    padding:4px;
    outline:none;
    background-image:-moz-linear-gradient(top,#E9E9E9,#FFF);
    background-image:-webkit-linear-gradient(top,#E9E9E9,#FFF);
    background-image:-o-linear-gradient(top,#E9E9E9,#FFF);
    background-image:linear-gradient(to bottom,#E9E9E9,#FFF);
    margin: 7px;
   }