.big-window{
    display:block;
    margin:0 auto;
    padding:20px;
    margin-bottom:10px;
    --bg-opacity: 1;
}
.grid{display:grid !important;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:2rem;gap:2rem;}
.main_pre{
         display:flow-root;
         min-height:400px;
         margin:10px;
         padding:0;
         flex-grow:1;
         box-sizing:border-box;
         background-color:#fff;
         border-radius:20px;
         overflow:hidden;
         box-shadow: 0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);
}
.main_pre div{padding:10px;}
.main_pre img{height:350px;}
.main_pre div a{display:block;margin:0 auto;font-size:14px;text-align:center;}
.main_pre a.blueback{margin-bottom:10px !important;}
.main_pre div a:hover{color:#5FF100 !important;}
.main_pre p{text-align:center;font-weight:100;color:#333;padding:10px 10px 0;}

@media only screen and (max-width:500px){

         .main_pre{min-width:100%;border:none;margin:10px 0;border-radius:0px;}
         .grid{grid-template-columns:repeat(1,minmax(0,1fr)) !important;grid-gap:1em;gap:1em;}


}