html {
  box-sizing: border-box;
}

*, *::after, *::before {
  box-sizing: inherit;
}

*, *:before, *:after {
  box-sizing: border-box;
  outline: none;
}



p {
  font-weight: 400;
}

a {
  text-decoration: none;
}

label {
  cursor: pointer;
}

.modal-btn {
  position: relative;
  display: table-cell;
  width: 100px;
  height: 100px;
  background-color: #2c3e50;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.3);
  border-radius: 50%;
  font-size: 36px;
  color: white;
  text-align: center;
  line-height: 2.75;
  transition: box-shadow 250ms ease;
}
.modal-btn:hover {
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
}

.modal-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  z-index: 10;
  visibility: hidden;
  transition: background-color 250ms linear;
}

.modal-content-hidden {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50%;
  height: auto;
  margin-top: -18%;
  margin-left: -25%;
  padding: 30px;
  background-color: white;
  border-radius: 4px;
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
  transform: scale(0);
  transition: transform 250ms ease;
  visibility: hidden;
  z-index: 20;
}
.modal-content-hidden .close {
  position: relative;
  float: right;
  font-size: 18px;
  transition: transform 500ms ease;
  z-index: 11;
}
.modal-conten-hidden .close:hover {
  color: #3498db;
  transform: rotate(540deg);
}
.modal-content-hidden header {
  position: relative;
  display: block;
  border-bottom: 1px solid #eee;
}
.modal-content-hidden header h2 {
  margin: 0 0 10px;
  padding: 0;
  font-size: 28px;
}
.modal-content-hidden article {
  position: relative;
  display: block;
  margin: 0;
  padding: 0;
  font-size: 16px;
  line-height: 1.75;
}
.modal-content-hidden footer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  width: 100%;
  margin: 0;
  padding: 10px 0 0;
}
.modal-content-hidden footer .button {
  position: relative;
  padding: 10px 30px;
  border-radius: 3px;
  font-size: 14px;
  font-weight: 400;
  color: white;
  text-transform: uppercase;
  overflow: hidden;
}
.modal-content-hidden footer .button:before {
  position: absolute;
  content: '';
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.2);
  transition: width 250ms ease;
  z-index: 0;
}
.modal-content-hidden footer .button:hover:before {
  width: 100%;
}
.modal-content-hidden footer .button.success {
  margin-right: 5px;
  background-color: #2ecc71;
}
.modal-content-hidden footer .button.danger {
  background-color: #e74c3c;
}

#modal {
  display: none;
}
#modal:checked ~ .modal-bg {
  visibility: visible;
  background-color: black;
  opacity: 0.7;
  transition: background-color 250ms linear;
}
#modal:checked ~ .modal-content-hidden {
  visibility: visible;
  transform: scale(1);
  transition: transform 250ms ease;
  z-index: 111;
}