css - Webpage extends beyond the HTML element -


i have created web page have used background gradient system make less harsh on eyes. has made me aware webpage extends past point of <html> element , continues scroll further. causes background gradient repeat second time below <body> element.

does know reason why happen , way either prevent page scrolling beyond point of <html> element or prevent background repeating 2nd time after <html> tag?

here example of happening:

example screenshot

here css background:

body{     background-repeat: no-repeat;     background: rgba(18,87,182,0); /* browsers not support gradients */     background: -webkit-linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 10%,rgba(255,0,0,0) 70%); /*safari 5.1-6*/     background: -o-linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 10%,rgba(255,0,0,0) 70%); /*opera 11.1-12*/     background: -moz-linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 10%,rgba(255,0,0,0) 70%); /*fx 3.6-15*/     background: linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 20%,rgba(255,0,0,0) 70%); /*standard*/ }

try this, add background-attachment: fixed; body,

body{      background-repeat: no-repeat;      background: rgba(18,87,182,0); /* browsers not support gradients */      background: -webkit-linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 10%,rgba(255,0,0,0) 70%); /*safari 5.1-6*/      background: -o-linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 10%,rgba(255,0,0,0) 70%); /*opera 11.1-12*/      background: -moz-linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 10%,rgba(255,0,0,0) 70%); /*fx 3.6-15*/      background: linear-gradient(rgba(86,213,251,1) 0%,rgba(18,87,182,0.5) 20%,rgba(255,0,0,0) 70%); /*standard*/      background-attachment: fixed;  }
<article>      <section id="intro">          <h1><strong>welcome! </strong></h1>          <br>          <br>                    writing goes here                    <strong> please click <a>here</a> begin helping alpha test.</strong>      </section>  </article>


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