#web_bg {
    /* 背景图像的地址（url括号里）  */
    /* 插入图片并且滤镜渐变 */
    background: url(/img/background-big.png),
    linear-gradient(60deg,
    rgba(255, 165, 150, 0.5) 5%,
    rgba(0, 228, 255, 0.35)),
    url(/img/index_img.jpg);
    background-repeat: no-repeat;
    background-size: cover;
}
/* background-color: #005AA7;
background: linear-gradient(to right, #FFFDE4, #005AA7);
background: -webkit-linear-gradient(to right, #FFFDE4, #005AA7); */
/* background-image: linear-gradient(to top, #a18cd1 0%, #fbc2eb 100%); */
/* background-image: linear-gradient(to top, #accbee 0%, #e7f0fd 100%); */
/* url(https://w.wallhaven.cc/full/73/wallhaven-73yvky.jpg); */
/* background-image: linear-gradient(180deg, #2af598 0%, #009efd 100%); */
/* background: -webkit-linear-gradient(0deg,
  rgba(247, 149, 51, 0.1) 0,
  rgba(243, 112, 85, 0.1) 15%,
  rgba(239, 78, 123, 0.1) 30%,
  rgba(161, 102, 171, 0.1) 44%,
  rgba(80, 115, 184, 0.1) 58%,
  rgba(16, 152, 173, 0.1) 72%,
  rgba(7, 179, 155, 0.1) 86%,
  rgba(109, 186, 130, 0.1) 100%);
background: -moz-linear-gradient(0deg,
  rgba(247, 149, 51, 0.1) 0,
  rgba(243, 112, 85, 0.1) 15%,
  rgba(239, 78, 123, 0.1) 30%,
  rgba(161, 102, 171, 0.1) 44%,
  rgba(80, 115, 184, 0.1) 58%,
  rgba(16, 152, 173, 0.1) 72%,
  rgba(7, 179, 155, 0.1) 86%,
  rgba(109, 186, 130, 0.1) 100%);
background: -o-linear-gradient(0deg,
  rgba(247, 149, 51, 0.1) 0,
  rgba(243, 112, 85, 0.1) 15%,
  rgba(239, 78, 123, 0.1) 30%,
  rgba(161, 102, 171, 0.1) 44%,
  rgba(80, 115, 184, 0.1) 58%,
  rgba(16, 152, 173, 0.1) 72%,
  rgba(7, 179, 155, 0.1) 86%,
  rgba(109, 186, 130, 0.1) 100%);
background: -ms-linear-gradient(0deg,
  rgba(247, 149, 51, 0.1) 0,
  rgba(243, 112, 85, 0.1) 15%,
  rgba(239, 78, 123, 0.1) 30%,
  rgba(161, 102, 171, 0.1) 44%,
  rgba(80, 115, 184, 0.1) 58%,
  rgba(16, 152, 173, 0.1) 72%,
  rgba(7, 179, 155, 0.1) 86%,
  rgba(109, 186, 130, 0.1) 100%);
background: linear-gradient(90deg,
  rgba(247, 149, 51, 0.1) 0,
  rgba(243, 112, 85, 0.1) 15%,
  rgba(239, 78, 123, 0.1) 30%,
  rgba(161, 102, 171, 0.1) 44%,
  rgba(80, 115, 184, 0.1) 58%,
  rgba(16, 152, 173, 0.1) 72%,
  rgba(7, 179, 155, 0.1) 86%,
  rgba(109, 186, 130, 0.1) 100%); */