@media screen and (max-width: 800px) {
    .nav {
        position: fixed;
        bottom: 50px;
        right: 20px;
        background-color: rgb(255, 255, 255);
        border-radius: 25px;
        z-index: 10;
      }
      .nav .nav_service {
        display: block;
        width: 50px;
        height: 50px;
        cursor: pointer;
      }
      .nav .nav-img {
        display: none;
      }
      .nav .line {
        display: none;
      }
      .pop-up {
        display: none;
        position: fixed;
        top: 0;
        width: 100vw;
        height: 100vh;
        align-items: center;
        justify-content: center;
        background-color: rgba(0, 0, 0, 0.65);
        z-index: 999;
      }
      .pop-up .pop_item {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 80%;
        background-color: #fff;
        border-radius: 4px;
      }
      .pop-up .pop_item .pop_title {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 16px 24px;
        border-bottom: 1px solid #e8e8e8;
      }
      .pop-up .pop_item .pop_title .close {
        cursor: pointer;
      }
      .pop-up .pop_item .pop_img {
        width: 60%;
        margin: 0 auto;
        padding: 20px 0;
      }
      .pop-up .pop_item .pop_text {
        margin-bottom: 20px;
        text-align: center;
        width: 100%;
        font-weight: 600;
        font-size: 14px;
        color: rgb(0, 122, 255);
      }
  }