* {
    margin: 0;
    padding: 0
}



em,
i {
    font-style: normal
}

li {
    list-style: none
}

img {
    border: 0;
    vertical-align: middle
}

button {
    cursor: pointer
}

a {
    color: #666;
    text-decoration: none
}

a:hover {
    color: skyblue;
}

button,
input {
    font-family: Microsoft YaHei, Heiti SC, tahoma, arial, Hiragino Sans GB, "\5B8B\4F53", sans-serif
}

input:focus {
    outline: none;
}


body {
    -webkit-font-smoothing: antialiased;
    background-color: #fff;
    font: 12px/1.5 Microsoft YaHei, Heiti SC, tahoma, arial, Hiragino Sans GB, "\5B8B\4F53", sans-serif;
    color: #666;
    overflow-y: auto; /* 允许垂直滚动 */
}

.hide,
.none {
    display: none
}

.clearfix:after {
    visibility: hidden;
    clear: both;
    display: block;
    content: ".";
    height: 0
}

.clearfix {
    *zoom: 1
}
@keyframes typing {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

.typewriter {
  overflow: hidden;
  white-space: nowrap;
  animation: typing 5s steps(20) infinite;
}
.xf_introduce{
font-weight: bold;

    
}