<!-- HTML -->

<!-- You can change the style of the horizontal line like this: --> 

<hr style="width:50%", size="3", color=black>  


<!-- Or like this: -->

<hr style="height:2px; width:50%; border-width:0; color:red; background-color:red">

hr {
  border:none;
  border-top:1px dashed #f00;
  color:#fff;
  background-color:#fff;
  height:1px;
  width:50%;
}

.blog {
    background-color: skyblue;
    color: rgba(0,0,0,.6);
    border: 32px solid yellow;
    border-radius: 36px;
    margin: 22px auto;
    padding: 13px 30px
px
 105px 30px;
    height: 280px;
    width: 50%;
}