* {
    box-sizing: border-box;
}

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

h1, h2, h3, h4 {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    margin: 10;
}

p {
    margin:10;
}

form {
  margin: 10;
}

.banner {
    text-align: center;
    margin: 0;
    height: 120px;
}

.lesson {
    text-align: center;
    margin: 0;
    height: 120px;
}

.footer {
    text-align: center;
    margin: 0;
}

.center {
    text-align: center;
    margin: 0;
}

.midcenter {
    text-align:left;
    margin-left:20%;
    margin-right:20%;
}

/* Create three equal columns that float next to each other */
.column {
    float: left;
    width: 33%;
    padding: 10px;
    text-align: center;
  }
  
/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

.colcenter {
  width:33%;
  padding: 10px;
  text-align:center;
}

  /* Create two equal columns that float next to each other */
.column2 {
  float: left;
  width: 50%;
  padding: 10px;
  text-align: center;
}
  
/* Clear floats after the columns */
.row2:after {
  content: "";
  display: table;
  clear: both;
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
  .column {
    width: 100%;
  }
}

@media screen and (max-width: 600px) {
  .column2 {
    width: 100%;
  }
}

.responsive {
  max-width: 100%;
  height: auto;
}

.referent {
  border-style: solid;
  border-color: #009246;
}

.image_credit {
    color: grey;
}

/* TOOLTIP */

.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted black;
}
  
.tooltip .tooltiptext {
  visibility: hidden;
  width: 300px;
  background-color: black;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  top: -5px;
  left: 110%;
}

.tooltip .tooltiptext::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 100%;
  margin-top: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: transparent black transparent transparent;
}
.tooltip:hover .tooltiptext {
  visibility: visible;
}

/* hide form fields populated by js after clicking on images */
.hidden_form {
  display: none;
  text-align: center;
}

/* DIVS for Drag and Drop */

#div2 {
  float: right;
  width: 150px;
  height: 400px;
  margin: 10px;
  padding: 10px;
  border: 1px solid black;
}

#div3 {
  float: left;
  width: 150px;
  height: 400px;
  margin: 10px;
  padding: 10px;
  border: 1px solid black;
}

#div4 {
  padding: 10px;
  border: 1px solid black;
  height: 160px;
}

/* Form classes */

.button {
  background-color: #009246;
  border: none;
  color: white;
  padding: 15px;
  text-align: center;
  display: inline-block;
  font-size: 14px;
  margin: 0px;
  cursor: pointer;
}