* {
  box-sizing: border-box;
}

body {
  background-color: black;
  background-image: url(cc-backinv.gif);
  padding: 20px;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  color: blac;
}

/* Center website */
.main {
  max-width: 1000px;
  margin: auto;
}

#intro {
	display: block;
}

#intro p {
	text-align: justify;
}

#myBtnContainer {
	position: -webkit-sticky; /* Safari & IE */
   position: sticky;
   top: 0;
   background: lightgray;
   padding: 0.5em 2em;
   border-radius: 0 0 1em 1em;
   margin: auto;
}

h1 {
  font-size: 3.5vw;
  word-break: normal;
}

.row {
  margin: 10px -16px;
}

/* Add padding BETWEEN each column */
.row,
.row > .column {
  padding: 8px;
}

/* Create three equal columns that floats next to each other */
.column {
  float: left;
  width: 33.33%;
  display: none; /* Hide all elements by default */
}

/* Clear floats after rows */ 
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* Content */
.content {
  background-color: white;
  padding: 10px;
  height: auto; /* 420px */
  border: solid #666 0px;
  border-radius: 1em;
  color: black;
}

.content p {
	min-height: 2.5em;
}

/* Style the buttons */
.btn {
  border: none;
  outline: none;
  padding: 1em 1em;
  background-color: white;
  cursor: pointer;
  margin: 0.5em;
  border-radius: 1em;
  width: 20%;
}

.btn:hover {
  background-color: #ddd;
}

.btn.active {
  background-color: #666;
  color: white;
}

.filterDiv {
  /* float: left; */
  background-color: lightgrey;
  color: #ffffff;
  margin: 2px;
  display: none; /* Hidden by default */
}

/* Style the buttons that are used to open and close the accordion panel */
.accordion {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  text-align: left;
  border: none;
  outline: none;
  transition: 0.4s;
  font-size: 1.25em;
  font-weight: bolder;	
}

.accordion:after {
  content: '\02795'; /* Unicode character for "plus" sign (+) */
  font-size: 13px;
  color: #777;
  float: right;
  margin-left: 5px;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active, .accordion:hover {
  background-color: #ccc;
}

.active:after {
  content: "\2796"; /* Unicode character for "minus" sign (-) */
}

/* Style the accordion panel. Note: hidden by default */
.panel {
  padding: 0 18px;
  background-color: white;
  max-height: 0;
  display: none;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

/* The "show" class is added to the filtered elements */
.show {
  display: block;
}

@media screen and (max-width: 1050px) {
.btn {
  width: 22%;
}}

@media screen and (max-width: 750px) {
#myBtnContainer {
   padding: 0px;
}
h1 {
  font-size: 4.5vw;
}
.column {
  width: 50%;
}
.btn {
  width: 45%;
}}

@media screen and (max-width: 500px) {
h1 {
  font-size: 6.5vw;
}
.column, .btn, .btnflt {
  width: 100%;
}
.btn {
  width: 96%;
}}

@media screen and (min-width: 600px) {
.accordion {
  display: none;
}
.panel {
  display: block;
  max-height: max-content;
}}