body{
color: #000;
    background: url(https://images.cnblogs.com/cnblogs_com/zhangky/1611278/o_QQ图片20191211153537.jpg) fixed;
    background-size: 100%;
    background-repeat: no-repeat;
   background-position: center;
}

#home{opacity:0.88}
#footer{
background-color: #ffffff;
    opacity: .6;
    font-size: 12px;
}
#comment_form{
  background-color: #ffffff;
    border-radius: 8px;
    padding: 10px;
}
.comment_textarea{width:auto}
div.commentform textarea.comment_textarea{
  width: 100%;
  border: 1px solid #9de8bd;
  outline: none;
  resize:none;
  height: auto;
  min-height: 300px;
  overflow-y: auto;
}
#commentbox_opt{
   text-align: center;
}
#btn_comment_submit{
  border: none;
    height: 40px;
    width: 120px;
    border-radius: 8px;
transition: all .3s;
}
#btn_comment_submit:hover{
  background-color: #390;
    color: #ffffff;
    cursor: pointer;
}