section {

     
    display : flex;
    flex-wrap: wrap;
    border-radius: 31px 31px 31px 31px;
    margin-top: 0px;
  width: 85vh; 
  padding: 0px;
    margin-bottom: 40px;
    margin-right: auto;
    margin-left: auto;
    margin-top: -20px;
    line-height: 1.5;
  margin-right: auto;
  margin-left: auto; 	
  /* opera does not like 'margin:20px auto' */
  /* background: #666; */
  border: 19px solid #DB362D;
  background: url(https://mars.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/04329/opgs/edr/ncam/NLB_781808042EDR_F1091998NCAM00354M_.JPG) no-repeat 0 0 fixed;
  /* https://developer.mozilla.org/en-US/docs/Web/CSS/background-size */
  background-size: cover;
  
  /* background: url(https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/01046/ids/edr/browse/rcam/RRF_1046_0759804806_506ECM_N0495338RHAZ02420_01_295J01_800.jpg) no-repeat 0 0 fixed; */
  /* https://developer.mozilla.org/en-US/docs/Web/CSS/background-size */
 
  text-align:left; 
  /* part 2 of 2 centering hack */
  voice-family: "\"}\"";
  voice-family:inherit;
   box-shadow: rgba(219,54,45, 0.4) 5px 5px, rgba(219,54,45, 0.3) 10px 10px, rgba(219,54,45, 0.2) 15px 15px, rgba(219,54,45, 0.1) 20px 20px, rgba(219,54,45, 0.05) 25px 25px;
  font-family: 'Martian Mono',-apple-system, Ariel, Verdana; 
  /* color: #c9ff23;  */
  overflow-y: auto;
  }

  
section img {
  max-height: auto;
  max-width: 100%;



}

_layouts/post.html

@@ -1,6 +1,4 @@
----
-layout: default
----
+
 <div class="post-content">
   <h1>
     {{ page.title }}