优化网页背景颜色和图片上传体验

body {
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
  -webkit-font-smoothing: antialiased;
  background-color: #f8f8f8;
}

/* 全局按钮样式 */
.button {
  font-family: inherit;
  text-align: center;
  cursor: pointer;
  border: none;
  text-decoration: none;
  outline: none;
  color: #ffffff;
  background-color: rgb(0, 120, 212);
  padding: 0.5rem 1.2rem;
  border-radius: 2px;
  font-size: 1rem;
  min-width: 6rem;
}

.button:hover {
  background-color: rgb(16, 110, 190);
}

.button.disabled {
  pointer-events: none;
  background-color: #cccccc;
  color: #666666;
}

/* 主要内容区域 */

.main {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #ffffff; /* 添加背景颜色 */
  padding: 2rem; /* 添加内边距 */
}

.main .title h3 {
  font-size: 2.3rem;
  font-weight: 300;
  margin: 0.8rem 0;
}

.hidden {
  display: none;
}

.reveal {
  opacity: 0;
}

.reveal:hover {
  opacity: 0.2;
}

/* 上传框 */
.upload-box {
  font-size: 0.8rem;
  color: #666666;
  cursor: pointer;
  width: 20rem; /* 增加宽度 */
  height: 15rem; /* 增加高度 */
  background: #fff;
  border: 0.1rem dashed #838388;
  border-radius: 0.4rem;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  margin: 1rem 0 2rem 0;
}

.upload-box.dragover {
  /* background-color: grey; */
  color: #eeeeee;
  border: 0.1rem solid rgb(0, 120, 212);
  box-shadow: inset 0 0 0 0.1rem rgb(0, 120, 212);
}

.upload-box:hover {
  border-color: rgb(0, 120, 212);
}

.upload-box #image-preview {
  max-width: 18rem; /* 增加最大宽度 */
  max-height: 12rem; /* 增加最大高度 */
  box-shadow: 0 4px 4px 0 rgba(0, 0, 0, 0.2), 0 6px 10px 0 rgba(0, 0, 0, 0.19);
}

#image-result {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
  max-height: 20rem;
}

#image-box {
  position: relative;
  width: auto;
  float: left;
  margin-bottom: 2rem;
}

#image-display {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
  max-height: 20rem;
}

#image-display.loading {
  filter: brightness(30%);
}

#pred-result {
  color: white;
  font-size: 1.5rem;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

#loader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  margin: 0 auto;
}

/* 动画 */
#spinner {
  box-sizing: border-box;
  stroke: #cccccc;
  stroke-width: 3px;
  transform-origin: 50%;
  animation: line 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite,
    rotate 1.6s linear infinite;
}
@keyframes rotate {
  from {
    transform: rotate(0);
  }
  to {
    transform: rotate(450deg);
  }
}
@keyframes line {
  0% {
    stroke-dasharray: 2, 85.964;
    transform: rotate(0);
  }
  50% {
    stroke-dasharray: 65.973, 21.9911;
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dasharray: 2, 85.964;
    stroke-dashoffset: -65.973;
    transform: rotate(90deg);
  }
}