* {
  margin: 0;
  padding: 0;
}

.mb-base { display: none; }

.mb-contents {
  position: fixed;
  z-index: 10000;
  background: #000;
  left: 50%;
  top: 50%;
  box-shadow: 0 0 2px rgba(200, 200, 200, 0.3), 0 0 2px #ccc, 0 0 5px rgba(0, 0, 0, 0.4);
}

.mb-decoration-close {
  position: absolute;
  display: block;
  z-index: 100001;
  top: -14px;
  left: -14px;
  cursor:pointer;
}