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

.body {
  min-height: 200vh;

  font-size: 30px;
}

.body--fixed {
  overflow-y: hidden;
}

.btn-open {
  display: block;
  justify-self: center;
  margin-top: 30vh;
  width: 600px;
  height: 150px;
  cursor: pointer;
  
  background-color: #27f153;
  border-radius: 100px;
  font-size: 30px;
  transition: all .7s;
}

.btn-open:hover {
  background-color: #299b42;
  font-size: 40px;
}

.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--open {
  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;

}