<!DOCTYPE html>
<html>
<head>
<style>
    .test {
        display: inline-block;
        margin: 20px;
        width: 300px;
        height: 150px;
        box-sizing: border-box;
        border: 50px solid blue;
    }

    .rounded {
        border-radius: 40%;
    }

    .missing-border {
        border-right-style: hidden;
    }

    .double {
        border-style: double;
    }

    .inset {
        border-style: solid;
    }

    .complex {
        border-right-style: double;
        border-bottom-styl