*{box-sizing: border-box;}
body{padding:0;margin:0;}
.container{display:flex;justify-content: center;align-items:flex-start;background-image:url(main-desktop.jpg) ;width:100%;height:100vh;background-repeat: no-repeat;
  background-position:center;background-size: cover;padding:48px 24px;overflow:auto;min-width:300px;}
.textpart{width:100%;max-width:400px;background-color: rgba(255,255,255,0.8);
    color:saddlebrown;font-size:20px;border-radius: 16px;padding:12px 32px 16px 32px;
  line-height: 20px;min-width:300px;
  }

@media screen and (min-width:801px) {
  .container{background-position:center;}
  .textpart{line-height: 24px;}
}