*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
}

.btn-open{
  width: 300px;
  height: 50px;
  font-size: 20px;
  cursor: pointer;
}

.modal{
  position: fixed;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #000000c1;
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
}
.modal--active{
  opacity: 1;
  visibility: visible;
}
.modal__window{
  position: relative;
  width: 50vw;
  min-height: 40vh;
  padding: 50px 20px 20px 20px;
  background-color: #fff;
  border-radius: 12px;
}
.modal__close-btn{
  position: absolute;
  top: 5px;
  right: 10px;
  width: 30px;
  height: 30px;
  font-size: 20px;
  font-weight: 700;
  background: none;
  border: none;
  cursor: pointer;
}