图标svg格式，开发工具正常真机不显示

<?xml version="1.0" encoding="UTF-8"?>
<svg width="57" height="51" fill="none" xmlns="http://www.w3.org/2000/svg">
  <g filter="url(#a)">
    <path d="M46.1046.190186h-35.24c-7.70779 0-12.51781 8.352404-8.64923 15.019014L19.8044 45.52c3.8504 6.6353 13.4301 6.6427 17.2907.0132l17.651-30.3107C58.6283 8.55587 53.8192.190186 46.1046.190186Z" fill="#fff" fill-opacity=".4" />
  </g>
  <defs>
    <filter id="a" x="-5.15039" y="-5.80981" width="67.27" height="62.3107" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
      <feFlood flood-opacity="0" result="BackgroundImageFix" />
      <feGaussianBlur in="BackgroundImage" stdDeviation="3" />
      <feComposite in2="SourceAlpha" operator="in" result="effect1_backgroundBlur_321_2" />
      <feBlend in="SourceGraphic" in2="effect1_backgroundBlur_321_2" result="shape" />
    </filter>
  </defs>
</svg>

wxss

.btn_shop {
  width: 70px !important;
  height: 61px;
  line-height: 61px !important;
  border-radius: unset !important;
  margin: 0 auto !important;
  position: absolute;
  left: 0;
  right: 0;
  top: -22px;
}

.btn_back {
  width: 70px;
  height: 61px;
}