.ex-content {
  /* display: flex; */
  /* flex-flow: column; */
  /* flex-direction: column; */
  /* flex-wrap: wrap; */
  align-items: center;/*垂直居中*/
  justify-content: center;/*水平居中*/
  /* width: 100vw; */
  /* height: calc(100vh - 164px); */
  /* width: 100%; */
  /* height: 100%; */
  /* min-height: 300px; */
  top: 10vh;
  position: relative;
  width: 100%;
  min-width: 300px;
  max-width: 600px;
  margin: 0 auto;
}
/* @media (width >= 400px) { */
.ex-content .tag {
  background-color: #ffffff;
  border-color: #a0cfff;
  color: #409eff;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  vertical-align: middle;
  height: 24px;
  padding: 0 9px;
  font-size: 12px;
  line-height: 1;
  border-width: 1px;
  border-style: solid;
  border-radius: 4px;
  box-sizing: border-box;
  white-space: nowrap;
  margin: 0 3px;
}
.ex-content .radio {
  display: flex;
  margin: 5px;
}
.ex-content .radio input {
  margin-top: 0px;
}
.ex-content .result {
  margin-left: 10px;
}
.ex-content button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  line-height: 1;
  height: 32px;
  white-space: nowrap;
  cursor: pointer;
  color: #409eff;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  transition: .1s;
  font-weight: 500;
  user-select: none;
  vertical-align: middle;
  -webkit-appearance: none;
  background-color: #ecf5ff;
  border: 1px solid #dcdfe6;
  border-color: #a0cfff;
  padding: 8px 15px;
  font-size: 14px;
  border-radius: 4px;
}
.ex-content button:hover {
  color: #ffffff;
  border-color: #409eff;
  background-color: #409eff;
  outline: none;
}
.ex-content button:disabled {
    background-color: #ecf5ff;
    color: #a0cfff;
    border-color: #d9ecff;
}
.ex-content button:disabled:hover {
  cursor: not-allowed;
}
.ex-content .next {
  float: right;
}
.ex-content pre {
  background-color: #f6f6f7;
  border-radius: 8px;
  padding: 8px;
}