* {box-sizing: border-box;}

body { 
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.header {
  overflow: hidden;
  background-color: #f1f1f1;
  padding: 20px 30px 20px 30px;
}

.header a {
  float: left;
  color: black;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-size: 18px; 
  line-height: 25px;
  border-radius: 4px;
}

.header a:hover {
  background-color: #ddd;
  color: black;
}

.header a.active {
  background-color: dodgerblue;
  color: white;
}

.header-right {
  float: right;
}

@media screen and (max-width: 500px) {
  .header a {
    float: none;
    display: block;
    text-align: left;
  }
  
  .header-right {
    float: none;
  }
}

.footer {
	left: 0;
	bottom: 0;
	width: 100%;
	background-color: #f1f1f1;
	color: black;
	text-align: left;
	padding: 5px 30px 5px 30px;
}

.centered_txt {
	margin-left: auto;
	margin-right: auto;
	padding-left:30px; 
	padding-right:30px;
	max-width:900px;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
  border: 1px solid #ddd;
}

th, td {
  text-align: left;
  padding: 7px;
}

tr:nth-child(even) {
  background-color: #f2f2f2;
}

/*
 * responsive grid
*/

.rt-container {
	margin: 0 auto;
	padding-left:12px;
	padding-right:12px;
}

.rt-row:before, .rt-row:after {
  display: table;
  line-height: 0;
  content: "";
}

.rt-row:after {
  clear: both;
}

[class^="col-rt-"] {
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -o-box-sizing: border-box;
  -ms-box-sizing: border-box;
  padding: 0 15px;
  min-height: 1px;
  position: relative;
}

@media (min-width: 768px) {
  .rt-container {
    width: 750px;
  }
  [class^="col-rt-"] {
    width: 49.9999999999%;
  }
  .col-rt-6, .col-rt-12 {
    width: 100%;
  }
}

@media (min-width: 1300px) {
	.rt-container { width: 1300px; }
	.col-rt-1 {	width:16.6%; }
	.col-rt-2 { width:30.33%; }
	.col-rt-3 { width:50%; }
	.col-rt-4 {	width: 67.664%; }
	.col-rt-5 {	width: 83.33%; }
}

.grid {
  max-width: 1300px;
  margin: 0 auto;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.grid-item {
  min-width: 300px;
  max-width: 300px;
  -webkit-box-flex: 1;
      -ms-flex: 1 1 300px;
          flex: 1 1 300px;
  padding-left: .5rem;
  padding-right: .5rem;
  margin-bottom: 1rem;
}
.grid-item figure {
  padding: 0;
  margin: 0;
}
.grid-item figure img {
  display: block;
  max-width: 100%;
}
.grid-item figcaption {
  display: block;
  padding: .625rem .5rem;
}