body {
    background-color: #e5e5f7;
    opacity: 0.8;
    background: linear-gradient(135deg, #0f8f8655 25%, transparent 25%) -10px 0/ 20px 20px, linear-gradient(225deg, #0f8f86 25%, transparent 25%) -10px 0/ 20px 20px, linear-gradient(315deg, #0f8f8655 25%, transparent 25%) 0px 0/ 20px 20px, linear-gradient(45deg, #0f8f86 25%, #e5e5f7 25%) 0px 0/ 20px 20px;
    }
.center {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 25%;
    height: auto;
  }