* {
  box-sizing: border-box;
}

body {
  background-color: #f1f1f1;
  padding: 20px;
  font-family: Arial;
}

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

hr {
  border: 0;
  border-top: 2px solid #d0d0d5;
  width: 80%;
  margin-left: 0;
}

h1 {
  font-size: 50px;
  word-break: break-all;
}

.row {
  margin: 8px -16px;
}

/* Add padding BETWEEN each column (if you want) */
.row,
.row > .column {
  padding: 8px;
}

/* Create three equal columns that floats next to each other */
@media screen and (max-width: 10000px) {
  .column {
    float: left;
    width: 33.33%;
    display: none; /* Hide columns by default */
  }
}

@media screen and (max-width: 800px) {
  .column {
    float: left;
    width: 50%;
    display: none; /* Hide columns by default */
  }
}

@media screen and (max-width: 400px) {
  .column {
    float: left;
    width: 100%;
    display: none; /* Hide columns by default */
  }
}

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

/* Content */
.content {
  background-color: white;
  padding: 13px;
  line-height: 25px;
}

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

/* Style the buttons */
.btn {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: white;
  cursor: pointer;
}

/* Add a grey background color on mouse-over */
.btn:hover {
  background-color: #ddd;
}

/* Add a dark background color to the active button */
.btn.active {
  background-color: #666;
  color: white;
}

.btn-group button {
  /*background-color: #666;  Green background */
  /*border: 1px solid #f1f1f1; /*Green border */
  border: none;
  color: #666; /* White text */
  padding: 6px 10px; /*Some padding */
  cursor: pointer; /* Pointer/hand icon */
  float: left; /* Float the buttons side by side */
  border-radius: 3px;
  margin-right: 10px;
}

.btn-group button:not(:last-child) {
  border-right: none; /* Prevent double borders */
}

/* Clear floats (clearfix hack) */
.btn-group:after {
  content: "";
  clear: both;
  display: table;
}

/* Add a background color on hover */
.btn-group button:hover {
  background-color: #d0d0d5;
}