@media (max-width: 991px) {
  html {
    font-size: 55%;
  }
  body.dark {
    --black-1: whitesmoke;
    --black-2: whitesmoke;
    --black-3: whitesmoke;
    --black-4: whitesmoke;
    --black-5: whitesmoke;
    --black-6: whitesmoke;
    --black-7: whitesmoke;
    --black-8: whitesmoke;
    --black-9: whitesmoke;
    --t-black-1: whitesmoke;
    --t-green: #2ecc40;
    --t-silver: hsla(0, 0%, 65%, 1);
    --t-white: hsla(40, 12%, 5%, 1);
  }
  aside.sidebar {
    height: 100vh;
    width: 30%;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 10;
    height: 100vh;
    opacity: 0;
    transform: scale(0);
    transform-origin: left;
  }
  .menu_btn {
    display: block;
  }
  .logo {
    position: absolute;
    top: 5%;
    left: 0;
    right: 0;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin: 0 auto;
  }
  .sidebar.open {
    opacity: 1;
    transform: scale(1);
  }
  .section {
    position: fixed;
    width: 100%;
    left: 0;
    top: 0;
  }
  .r-logo {
    top: 5%;
    left: -70%;
    padding: 0 2%;
  }
  .menu_btn {
    position: fixed;
    top: 3%;
    right: 5%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 10000;
  }
  .menu_btn:hover i {
    transform: rotate(360deg);
  }
  .menu_btn i {
    background-color: var(--t-green);
    padding: 0.8rem 1.5rem;
    border-radius: 0.5rem;
    color: var(--t-white);
    font-size: 3rem;
  }
  .home .home-container .box .image img {
    margin-top: 2rem;
  }
  .popup_portfolio {
    left: 0;
  }
}

@media (max-width: 768px) {
  aside.sidebar {
    height: 100vh;
    width: 40%;
  }
  .home .home-container .box .image {
    width: 100%;
    text-align: center;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    margin-top: 3rem;
  }
  .home .home-container .box .image img {
    width: 40rem;
    margin-top: 13rem;
    animation: up 3s ease-in-out infinite alternate;
  }
  .popup_portfolio {
    left: 0;
  }
  .popup_container .box {
    flex: 1 1 30rem;
  }
  .popup_container {
    width: 70%;
    margin: 0 auto;
  }
  .contact_contacts .contact_icon {
    flex: 1 1 15rem;
  }
}

@media (max-width: 560px) {
  aside.sidebar {
    height: 100vh;
    width: 50%;
  }
}

@media (max-width: 450px) {
  html {
    font-size: 50%;
  }
  ::-webkit-scrollbar {
    width: 0.5rem;
  }
  ::-webkit-scrollbar-thumb {
    border-radius: 0.5rem;
    background-color: var(--green);
  }
  section {
    padding: 10rem 3%;
    padding-bottom: 0;
    padding-top: 2rem;
  }
  section.home {
    padding-top: 0;
  }
  aside.sidebar {
    height: 100vh;
    width: 70%;
  }
  .popup_container {
    width: 80%;
  }
  .r-logo {
    top: 5%;
    left: -70;
    padding: 0 2%;
  }
  .contact_contacts .contact_icon {
    flex: 1 1 15rem;
  }
  .contact_form form .name_sub {
    gap: 1rem 1rem;
  }
  .name_sub .subject,
  .name_sub .name {
    flex: 1 1 20rem;
  }
  .home .home-container .box .image img {
    width: 40rem;
    margin-top: 9rem;
  }
  .portfolio_container .portfolio_card img {
    width: 100%;
    /* height: 25rem; */
  }
  .popup_portfolio {
    top: 7%;
  }
}