body {
    background-image: url("https://thejang.com/textures/i2/Texture_multicolor_040.jpg");
}


.center {
  margin-left: auto;
  margin-right: auto;
}

#header {
    text-align: center;
    color: aliceblue;
}

#main {
  width: 700px;
    height: 367px;
  margin-left: 590px;
  margin-bottom: 20px;
  padding: 15px;
  position: relative;
  background-color: #111112; 
  border-style:inset;
  border-color: black;
  border-width: 3px;
    color:#9cdbb4;
}

body::-webkit-scrollbar {
  width: 15px;               /* width of the entire scrollbar */
}

body::-webkit-scrollbar-track {
  background: yellow;        /* color of the tracking area */
}

body::-webkit-scrollbar-thumb {
  background-color: red;    
  border-radius: 13px;       
}