* {
  font-family: sans-serif;
  color: antiquewhite;
}
.body{
  min-height: 200vh;
}
.body--fixed{
  overflow-y: hidden;
}

.btn-open{
  width: 300px;
  position: relative;
  top:50vh;
  left: 40vw;
  background: black;
  border-radius: 100px;
  padding: 15px 30px;
  font-size: 20px;
  cursor: pointer;
}

.modal__close-btn{
  position: absolute;
  color: black;
  top: 5px;
  right: 10px;
  width: 30px;
  height: 30px;
  font-size: 20px;
  font-weight: 700;
  background: none;
  border: none;
  cursor: pointer;
}
.modal{
  position: fixed;
  inset: 0;
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #000000c1;
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
}

.modal__window{
  color: black;
  position: relative;
  width: 50vw;
  min-height: 40vh;
  padding: 50px 20px 20px 20px;
  background-color: aliceblue;
  border-radius: 12px;
}

.modal--open{ 
  visibility: visible;
  opacity: 1;
}