* {
    box-sizing: border-box;
  }
  
  /* Add a gray background color with some padding */
  body {
    font-family: Arial;
    padding: 20px;
    background: #f1f1f1;
    background-image: url(img1.fpg)
  }
  
  /* Header/Blog Title */
  .header {
    padding: 30px;
    font-size: 30px;
    text-align: center;
    background: solid gray;
  }
  
  /* Add a card effect for articles */
  .card {
     /*background-color: plum;*/
     padding: 20px;
     margin-top: 20px;
     font-size: 100%;
  }
  
  /* Footer */
  .footer {
    padding: 20px;
    text-align: center;
    margin-top: 40%;
  }
  
  /* Responsive layout - when the screen is less than 800px wide, make the two columns stack on top of each other instead of next to each other */
  @media screen and (max-width: 800px) {
    .leftcolumn, .rightcolumn {   
      width: 100%;
      padding: 0;
    }
  }
  body {
    background-color: lightgray;
    text-align: center;
}
img, object {
  max-height: 100%;
  max-width: 100%;
}
iframe, object {
  max-height: 100%;
  max-width: 100%;
}
.prevent-select {
  user-select: none; /* supported by Chrome and Opera */
  -webkit-user-select: none; /* Safari */
  -khtml-user-select: none; /* Konqueror HTML */
  -moz-user-select: none; /* Firefox */
  -ms-user-select: none; /* Internet Explorer/Edge */
}
nav.sitenav {
  color: #3f729b;
  text-align: center;
}
nav.sitenav p {
  display: inline-block;
  margin: 0.5em;
}
.card0 {
  float: left;
}
.carda {
  float: left;
  margin-left: 3.25%; 
  margin-top: 12.5%;
}
.cardb {
  float: left;
  margin-left: 3.25%; 
  margin-top: 12.5%;
}
.cardc {
  float: right;
  margin-right: 30%;
  margin-top: 12.5%;
}