/* MathGuru — shared answer-input behaviour for addition / subtraction / multiplication.
   NOT linked by division (its inputs have no placeholder, which the vanish rule below needs).

   The empty box style is the theme default (red border, from theme-toggle.js). Once a digit is
   typed the box vanishes so only the number floats — relies on each input having placeholder=" "
   so :placeholder-shown flips off on fill. */
body #problemArea .input-box:not(:placeholder-shown),
body #problemArea .input-box:not(:placeholder-shown):focus {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    outline: none !important;
    transform: none !important;
}