* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  margin: 0;
  padding: 0;
  height: 100vh; 
  background-image: radial-gradient(white, grey, black);
  background-color: black;
  background-repeat: no-repeat;
  /*position: relative;*/
   overflow: hidden;
}
.container {
  display: flex;
  flex-wrap: wrap;
  padding: 10px;
  gap: 20px;
}
  
.box {
  flex: 1 1 300px;
  min-width: 250px;
  background: rgba(255, 255, 255, 0.8);
  padding: 20px;
  border-radius: 8px;
}
  
@media (max-width: 600px) {
  .box {
    flex: 1 1 100%;
  }
}