How To Change Mobile Navigation CSS

@media all and (max-width: 1000px) {
    .header-menu {
        position: relative;
        z-index: 1;
        width: 90%;
        max-width: 600px;
        margin: 0 auto 40px;
      }

      .menu-toggle {
        background: #4ab2f1 url('../images/menu-icon.png') right center no-repeat;
        padding: 15px;
        font-size: 15px;
        font-weight: bold;
        color: #fff;
        text-transform: uppercase;
        cursor: pointer;
      }

      .top-menu {
        display: none;
      }

      .top-menu > li {
        position: relative;
        margin: 1px 0;
        background-color: #f6f6f6;
      }

      .top-menu > li > a {
        display: block;
        min-height: 55px;
        padding: 18px;
        font-size: 15px;
        color: #555;
      }

      .top-menu > li > a:focus {
        position: relative;
        z-index: 1;
      }

      .top-menu .sublist {
        display: none;
        background-color: #fff;
        padding: 5px 0;
      }

      .top-menu .sublist li {
        position: relative;
        margin: 1px 0 1px 20px;
      }

      .top-menu .sublist li a {
        display: block;
        padding: 15px 18px;
        font-size: 15px;
      }

      .sublist-toggle {
        position: absolute;
        top: 0;
        right: 0;
        width: 55px;
        height: 55px;
        border-left: 1px solid #fff;
        background: url('../images/toggle-black.png') center no-repeat;
        padding: 15px;
        font-size: 15px;
        font-weight: bold;
        color: #fff;
        text-transform: uppercase;
        cursor: pointer;
      }

      .sublist .sublist-toggle {
        height: 49px;
      }

      .sublist .sublist li {
        background-color: #f6f6f6;
      }

      .sublist .sublist .sublist li {
        background-color: #fff;
      }

      .block-category-navigation {
        display: none;
      }

      .block-account-navigation {
        float: none;
        margin: auto !important;
      }

      .write-review .review-rating {
        text-align: center;
      }

      .write-review .review-rating div.name-description {
        width: 100%;
        margin: 0 5px 0 0;
        text-align: center;
      }
}