* {
  /* 移除所有元素的内边距 */
  padding: 0;
  /* 移除所有元素的外边距 */
  margin: 0;
  /* 调整IE浏览器的文本大小 */
  -ms-text-size-adjust: 100%;
  /* 调整Webkit内核浏览器的文本大小 */
  -webkit-text-size-adjust: 100%;
  /* 优化Firefox浏览器的字体平滑 */
  -moz-osx-font-smoothing: grayscale;
  /* 优化Webkit内核浏览器的字体平滑 */
  -webkit-font-smoothing: antialiased;
  /* 设置Webkit内核浏览器的盒模型 */
  -webkit-box-sizing: border-box;
  /* 设置标准的盒模型 */
  box-sizing: border-box;
}

:root {
  --post-spacing: 1.78vw;
  --post-size: 25vw;
  --mask-size: 100vw;
}


.gallery-header {
  margin-top: 72px;
  text-align: center;
  font-weight: bold;
  text-transform: uppercase;
  font-size: 36px;
  font-weight: bold;
  color: #2C3E50;
  margin-top:30px;
  margin-bottom: 30px;
}

.gallery-header {
  margin-top: 72px;
}


#banner {
  overflow: hidden;
  position: relative;
  width: 100vw;
  height: calc(var(--post-size) / 0.72);
  -webkit-mask: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNDQwIiBoZWlnaHQ9IjUwMCIgdmlld0JveD0iMCAwIDE0NDAgNTAwIiBpZD0iaiI+CiAgPHBhdGggZmlsbD0icmdiKDIwMCwyMDAsMjAwKSIgZmlsbC1ydWxlPSJldmVub2RkIiBkPSJNMCAwczI3NS4wNCAxMDAgNzIwIDEwMFMxNDQwIDAgMTQ0MCAwdjUwMHMtMjc1LjA0LTEwMC03MjAtMTAwUzAgNTAwIDAgNTAwVjB6Ii8+Cjwvc3ZnPgo=);
          mask: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNDQwIiBoZWlnaHQ9IjUwMCIgdmlld0JveD0iMCAwIDE0NDAgNTAwIiBpZD0iaiI+CiAgPHBhdGggZmlsbD0icmdiKDIwMCwyMDAsMjAwKSIgZmlsbC1ydWxlPSJldmVub2RkIiBkPSJNMCAwczI3NS4wNCAxMDAgNzIwIDEwMFMxNDQwIDAgMTQ0MCAwdjUwMHMtMjc1LjA0LTEwMC03MjAtMTAwUzAgNTAwIDAgNTAwVjB6Ii8+Cjwvc3ZnPgo=);
  -webkit-mask-repeat: no-repeat;
          mask-repeat: no-repeat;
  -webkit-mask-position: center;
          mask-position: center;
  -webkit-mask-size: var(--mask-size);
          mask-size: var(--mask-size);
  position: absolute;
  top: 10%;
}

#banner .img-wrapper {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  position: absolute;
  width: 100%;
  float: left;
  height: calc(var(--post-size) / 0.72);
  -webkit-transform: translate(13.39vw, 0);
          transform: translate(13.39vw, 0);
  -webkit-animation: admission 1.5s;
          animation: admission 1.5s;
}

#banner .img-wrapper .img-box {
  height: 100%;
  display: inline-block;
  margin-right: var(--post-spacing);
  position: relative;
  cursor: pointer;
}

#banner .img-wrapper .img-box .info {
  position: absolute;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  text-align: center;
  color: rgba(255, 255, 255, 0.0);
  font-size: 2rem;
}

#banner .img-wrapper .img-box .info:hover {
  background: rgba(23, 23, 23, 0.3);
  color: white;
}

#banner .img-wrapper .img-box img {
  width: var(--post-size);
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  -o-object-position: center;
     object-position: center;
  -o-object-fit: cover;
     /* object-fit: cover; */
     object-fit: contain;
}

#banner .img-wrapper .img-box:last-child {
  -webkit-transform: translate(-160.68vw, 0);
          transform: translate(-160.68vw, 0);
}

.btn-group {
  height: 15vh;
  position: absolute;
  left: 50%;
  bottom: 0%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  -webkit-transition: 1s;
  transition: 1s;
  opacity: 0;
}

.btn-group .btn {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 1px solid #171717;
  background-color: #fff;
  margin: 10px;
  cursor: pointer;
  -webkit-transition: 0.4s;
  transition: 0.4s;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

.btn-group .btn:hover {
  -webkit-transform: scale(1.2);
          transform: scale(1.2);
  background-color: #000;
}

.btn-group .btn:hover .icon {
  fill: #fff;
}

.btn-group .btn .icon {
  width: 30px;
  height: 30px;
}

.btn-group .btn .right {
  -webkit-transform: rotate(180deg);
          transform: rotate(180deg);
}

.img-list {
  left: 0;
}

@-webkit-keyframes admission {
  0% {
    -webkit-transform: translate(140vw, 0);
            transform: translate(140vw, 0);
  }
  100% {
    -webkit-transform: translate(13.39vw, 0);
            transform: translate(13.39vw, 0);
  }
}

@keyframes admission {
  0% {
    -webkit-transform: translate(140vw, 0);
            transform: translate(140vw, 0);
  }
  100% {
    -webkit-transform: translate(13.39vw, 0);
            transform: translate(13.39vw, 0);
  }
}