css overlay

.modal-overlay {
  position: fixed;
  height: 100vh;
  width: 100%;
  left: 0;
  top: 0;
  background: rgba(0, 0, 0, 0.4);
  pointer-events: none;

  opacity: 0;
  transition: all 400ms ease;
}

.modal-overlay.active {
  opacity: 1;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, calc(-50% - 10px));
  z-index: 300;
  background: #fff;
  min-width: 550px;
  font-family: "Roboto", sans-serif;
  box-shadow: 0 5px 26px -8px rgba(0, 0, 0, 0.3);
  border-radius: 20px;
  display: flex;

  opacity: 0;
  pointer-events: none;
  transition: all 400ms ease;
}

.modal.active {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%);
}

.modal .close-btn {
  position: absolute;
  right: 20px;
  top: 20px;
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
}

.modal .left {
  background: #242424;
  color: #fff;
  border-radius: 20px;
  box-shadow: 17px 0 17px -8px rgba(0, 0, 0, 0.3);
  padding: 24px 16px;
  text-align: center;
}

.modal .left h3 {
  font-size: 22px;
  text-transform: uppercase;
  margin: 0;
}

.modal .left h3.sale-text {
  font-size: 36px;
}

.modal .left .discount p {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: #ebff00;
  margin: 0;
  margin-top: 32px;
}

.modal .left .discount .discount-percent {
  font-size: 60px;
  font-weight: 300;
}

.modal .right {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.modal .right h2 {
  margin: 0;
  text-transform: uppercase;
  font-size: 24px;
}

.modal .right p {
  color: #222;
}

.modal .right .discount-btn {
  text-decoration: none;
  background: #ff5555;
  align-self: flex-start;
  padding: 8px 32px;
  color: #fff;
  text-transform: uppercase;
  font-weight: bold;
  border-radius: 20px;
}

.modal .bg-shape {
  position: absolute;
  height: 12px;
  width: 40%;
  background: linear-gradient(180deg, #04b6c1 0%, #0e8a91 100%);
  border-radius: 20px 20px 0 0;
  top: -12px;
  left: 40%;
}

@media (max-width: 600px) {
  .modal {
    flex-direction: column;
    min-width: 300px;
  }

  .modal .bg-shape {
    display: none;
  }

  .modal .close-btn {
    color: #eee;
    right: 8px;
    top: 8px;
  }

  .modal .left .discount-text {
    display: flex;
    gap: 8px;
    justify-content: center;
  }

  .modal .left h3,
  .modal .left h3.sale-text {
    font-size: 24px;
  }

  .modal .left .discount p {
    margin-top: 20px;
  }

  .modal .right {
    padding: 24px;
    text-align: center;
  }

  .modal .right h2 {
    text-transform: none;
  }

  .modal .right h2 br {
    display: none;
  }

  .modal .right .discount-btn {
    align-self: auto;
  }
}