* {
    box-sizing: border-box;
}

body
{
  margin: 0;
  padding: 0;
  height: 200vh;
  background-color: white;
  background-blend-mode: lighten;

}

h1 {
    color: black;
    font-family: verdana;
    font-size: 180%;
}

h2 {
    color: black;
    font-family: verdana;
    font-size: 150%;
}
h3 {
    color: black;
    font-family: verdana;
    font-size: 130%;
}
h4 {
    color: black;
    font-family: verdana;
    font-size: 120%;
}



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

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 */
.column {
    float: left;
    width: 33.33%;
    display: none; /* Hide columns by default */
}

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

/* Content */
.content {
    background-color: white;
    padding: 30px;
}

/* 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: slategray;
  cursor: pointer;
  margin-top: 10px;

}

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



.rotate90 {
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -o-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    transform: rotate(90deg);
}