* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
    background-color: #e6e6e6;
  font-size: 1.0em;
}
a {
    text-decoration: none;
    color: blue;
}
.nav {
    width: 100%;
    height: 40px;
    line-height: 40px;
    background-color: navy;
    color: #ffffff;
    font-size: 1.1em;
    font-weight: bold;
   
  }
.nav a {
    color: white;
    text-decoration: none;
}

.responsive {
  max-width: 100%;
  height: auto;
} 
.header  {
 background-image: linear-gradient(#ffffff, #d4dfed);
width: 100%;
}
.column {
  float: none;
  width: 900px;
  padding: 0 10px;
  margin: auto;   
}
.row {margin: 0 -5px;}

.row:after {
  content: "";
  display: table;
  clear: both;
}

@media screen and (max-width: 600px) {
  .column {
    width: 100%;
    display: block;
    margin-bottom: 20px;
  }

}

.card {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  padding: 16px;
    background-color: #ffffff;
border-style: solid;
border-width: 2px;
border-color: #ff0000;
border-radius: 7px;
}
.footer {
    height: 60px;
line-height: 60px;
background-color: navy;
color: #ffffff;
font-size: 0.9em;
}