main {
    margin: 50px;
    margin-top: 50px;
    margin-bottom: 50px;
    font-family: Arial, Helvetica, sans-serif;
    background-color: lavender;
}

html {
    background-color: lavender;
}

img.pfp {
    border-radius:50%;
    display:block;
    margin-left:auto;
    margin-right:auto;
    
}

div.center {
    text-align:center;
}

div.space {
    padding-bottom: 25px;
    padding-top: 25px;
}

a:link {
    color: white;
}

a:visited {
    color: lightgray;
}

a:hover {
    color: grey;
}

a:active {
    color: lightgrey;
}

nav {
    background-color: #333;
    color: white;
    padding: 10px;
}

ul {
    display: flex;
    justify-content: space-around;
    list-style-type: none;
    padding: 0;
}

li {
    padding: 5px 10px;
}

.button {
    background-color: #04AA6D;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

* {
    box-sizing: border-box;
}

.row {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    padding: 0 4px;
    text-align: center;
}

.column {
    -ms-flex: 25%;
    flex: 25%;
    max-width: 25%;
    padding: 0 4px;
    text-align: center;
}

.column img {
    margin-top: 8px;
    vertical-align: middle;
    width: 100%;
    text-align: center;
}

@media screen and (max-width: 800px) {
  .column {
    -ms-flex: 50%;
    flex: 50%;
    max-width: 50%;
    text-align: center;
  }
}

@media screen and (max-width: 600px) {
  .column {
    -ms-flex: 100%;
    flex: 100%;
    max-width: 100%;
    text-align: center;
  }
}

div.space {
    padding-bottom: 20px
}