body {
  font-family: Arial;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  background-color: black;
}
.periodic {
  position: relative;
  height: 200px;
  margin-right: -1px;
  text-shadow: none;
}
.periodic-row {
  clear: both;
  height: 10%;
}
.periodic-row2 {
  clear: both;
  height: 3.0%;
}
.cell {
  float: left;
  position: relative;
  width: 5.55%;
  height: 100%;
}
.cell2 {
  float: left;
  position: relative;
  width: 33.3%;
  height: 100%;
}
.element {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 1px;
  right: 1px;
  box-sizing: border-box;
  box-shadow: 0px 0px 4px rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 0, 0, 0.05);
  text-align: center;
  cursor: default;
  pointer-events: none;
  -webkit-transition: all 200ms ease;
  transition: all 200ms ease;
  background-color: gray;
}
.cell:hover .element {
  border-color: rgba(0, 0, 0, 0.1);
  -webkit-transform: scale(5, 5);
  -ms-transform: scale(5, 5);
  transform: scale(5, 5);
  z-index: 1;
  background-color: gray;
}
.at_num,
.at_details {
  position: absolute;
  font-size: 4px;
  color: rgba(255, 255, 255, 0.5);
  opacity: 0;
}
.at_num {
  top: 4px;
  right: 5px;
}
.symbol {
  position: absolute;
  top: 50%;
  left: 0px;
  right: 0px;
  margin-top: -4px;
  font-size: 9px;
  line-height: 1;
  height: 9px;
  color: rgba(255, 255, 255, 0.9);
}
.at_details {
  bottom: 4px;
  left: 0px;
  right: 0px;
}

.cell .zoom1 {
  -webkit-transform-origin: 0 0;
  -ms-transform-origin: 0 0;
  transform-origin: 0 0;
}
.cell .zoom2 {
  -webkit-transform-origin: 0 50%;
  -ms-transform-origin: 0 50%;
  transform-origin: 0 50%;
}
.cell .zoom3 {
  -webkit-transform-origin: 100% 0;
  -ms-transform-origin: 100% 0;
  transform-origin: 100% 0;
}
.cell .zoom4 {
  -webkit-transform-origin: 0 25%;
  -ms-transform-origin: 0 25%;
  transform-origin: 0 25%;
}
.cell .zoom5 {
  -webkit-transform-origin: 25% 25%;
  -ms-transform-origin: 25% 25%;
  transform-origin: 25% 25%;
}
.cell .zoom6 {
  -webkit-transform-origin: 25% 50%;
  -ms-transform-origin: 25% 50%;
  transform-origin: 25% 50%;
}
.cell .zoom7 {
  -webkit-transform-origin: 50% 25%;
  -ms-transform-origin: 50% 25%;
  transform-origin: 50% 25%;
}
.cell .zoom8 {
  -webkit-transform-origin: 75% 25%;
  -ms-transform-origin: 75% 25%;
  transform-origin: 75% 25%;
}
.cell .zoom9 {
  -webkit-transform-origin: 100% 25%;
  -ms-transform-origin: 100% 25%;
  transform-origin: 100% 25%;
}
.cell .zoom10 {
  -webkit-transform-origin: 100% 50%;
  -ms-transform-origin: 100% 50%;
  transform-origin: 100% 50%;
}
.cell .zoom11 {
  -webkit-transform-origin: 75% 50%;
  -ms-transform-origin: 75% 50%;
  transform-origin: 75% 50%;
}
.cell .zoom12 {
  -webkit-transform-origin: 0 75%;
  -ms-transform-origin: 0 75%;
  transform-origin: 0 75%;
}
.cell .zoom13 {
  -webkit-transform-origin: 25% 75%;
  -ms-transform-origin: 25% 75%;
  transform-origin: 25% 75%;
}
.cell .zoom14 {
  -webkit-transform-origin: 0 100%;
  -ms-transform-origin: 0 100%;
  transform-origin: 0 100%;
}
.cell .zoom15 {
  -webkit-transform-origin: 25% 100%;
  -ms-transform-origin: 25% 100%;
  transform-origin: 25% 100%;
}
.cell .zoom16 {
  -webkit-transform-origin: 100% 100%;
  -ms-transform-origin: 100% 100%;
  transform-origin: 100% 100%;
}
.cell .zoom17 {
  -webkit-transform-origin: 100% 75%;
  -ms-transform-origin: 100% 75%;
  transform-origin: 100% 75%;
}
.cell .zoom18 {
  -webkit-transform-origin: 75% 75%;
  -ms-transform-origin: 75% 75%;
  transform-origin: 75% 75%;
}
.cell .zoom19 {
  -webkit-transform-origin: 75% 100%;
  -ms-transform-origin: 75% 100%;
  transform-origin: 75% 100%;
}
.cell .zoom20 {
  -webkit-transform-origin: 50% 100%;
  -ms-transform-origin: 50% 100%;
  transform-origin: 50% 100%;
}
.cell .zoom21 {
  -webkit-transform-origin: 50% 75%;
  -ms-transform-origin: 50% 75%;
  transform-origin: 50% 75%;
}
.cell .zoom22 {
  -webkit-transform-origin: 50% 100%;
  -ms-transform-origin: 50% 100%;
  transform-origin: 50% 100%;
}
.cell .zoom23 {
  -webkit-transform-origin: 75% 100%;
  -ms-transform-origin: 75% 100%;
  transform-origin: 75% 100%;
}

@media (min-width: 600px) {
  .periodic {
    height: 460px;
    margin-right: -2px;
  }
  .element {
    right: 2px;
    bottom: 2px;
  }
  .at_num,
  .at_details {
    font-size: 4px;
    opacity: 1;
  }
  .symbol {
    margin-top: -17px;
    font-size: 16px;
    font-weight: bold;
    line-height: 30px;
    height: 30px;
    color: rgba(255, 255, 255, 0.75);
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.5);
  }
}
@media (min-width: 800px) {
  .periodic {
    height: 540px;
  }
  .symbol {
    font-size: 20px;
  }
}
@media (min-width: 992px) {
  .periodic {
    height: 680px;
  }
  .at_num,
  .at_details {
    font-size: 5px;
  }
  .symbol {
    font-size: 24px;
  }
}
@media (min-width: 1200px) {
  .periodic {
    height: 800px;
  }
  .at_num,
  .at_details {
    font-size: 6px;
  }
  .symbol {
    font-size: 30px;
  }
}

.responsive {
  width: 100%;
  height: 100%;
}

/* Popup Box */

/* The Modal (background) */
.modal {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 1; /* Sit on top */
  padding-top: 100px; /* Location of the box */
  left: 0;
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}
/* Modal Content */
.modal-content {
  position: relative;
  background-color: #fefefe;
  margin: auto;
  padding: 0;
  border: 1px solid #888;
  width: 80%;
  box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
  -webkit-animation-name: animatetop;
  -webkit-animation-duration: 0.4s;
  animation-name: animatetop;
  animation-duration: 0.4s
}
/* Add Animation */
@-webkit-keyframes animatetop {
  from {top:-300px; opacity:0} 
  to {top:0; opacity:1}
}
@keyframes animatetop {
  from {top:-300px; opacity:0}
  to {top:0; opacity:1}
}
/* The Close Button */
.close {
    color: #aaa;
    float: right;
    font-size: 60px;
    font-weight: bold;
}
.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}
button.button {
  background:none;
  border-top:none;
  border-right:none;
  border-left:none;
}
.grid-container {
  display: grid;
  grid-template-columns: auto auto;
  grid-gap: 15px;
  padding: 20px;
}
.grid-container > div {
  line-height: 1.6;
}
p {
  text-align: justify;
  text-justify: inter-word;
}