body {
  background-color: black;
  color: black;
  font-family: Verdana;
  margin: 0;
}

/* Full-page border overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 4px solid #008000;
  pointer-events: none;
  box-sizing: border-box;
}

h1 {
  justify-self:center;
  color:black;
}

p {
  color:white;
}

ul {
  color:white;
}

a{
  color:red;
}

.my-box {
  justify-self:center;
  width: 500px;
  height: 700px;
  background-color: lightblue;
  border: 2px solid black;
  padding: 20px;
  margin: 10px;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}

/* blurred background layer */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("https://upload.wikimedia.org/wikipedia/commons/6/60/Green_Day_-_Hella_Mega_Tour_-_August_10%2C_2021.jpg?_=20210817065054") center/cover no-repeat;
  filter: blur(10px);
  transform: scale(1.1); /* prevents edge cut-off from blur */
  z-index: -1;
}

/* optional: makes your box stand out */
.my-box {
  background: rgba(255, 255, 255, 0.75);
  padding: 20px;
  margin: 80px auto;
  width: 80%;
  max-width: 600px;
  border-radius: 12px;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
}

/* sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: 180px;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  padding: 15px;
  box-sizing: border-box;
  color: white;
}

.sidebar h3 {
  margin-top: 0;
  color: lime;
}

.sidebar a {
  display: block;
  color: white;
  text-decoration: none;
  margin: 10px 0;
}

.sidebar a:hover {
  color: lime;
}


/* main content shifted so it doesn't overlap sidebar */