body{
  height: 100vh;
}
.ai_content{
  height: 100%;
  background: #fff;
  background:url(../image/timg.jpg) no-repeat center center;
  background-size:contain; 
  padding-top:160px;
  box-sizing: border-box; 
}
.ai_title{
  width: 100%;
  height: 60px;
  background: rgba(15, 25, 50, 0.3);
  color: #fff;
  line-height: 60px;
  text-align: center;
  font-size: 30px;
}
#box {
  width: 800px;
  height: 600px;
  background: rgba(0, 0, 0, .3);
  margin: 0 auto;
}
.b_body {
  width: 100%;
  height: 420px;
  overflow: auto;
  padding: 20px 0;
  box-sizing: border-box;
}
.b-head {
  width: 100%;
  height: 60px;
  background-color: #4CAF50;
}
.h_span {
  color: #fff;
  font-size: 18px;
  line-height: 60px;
  float: left;
  user-select: none;
  cursor: default;
  margin-left: 30px;
}
.rotWord, .mWord {
  width: 100%;
  margin-top: 10px;
  overflow: hidden;
}
.rotWord span {
  background: url(../image/head.jpg);
  background-size:100% 100%; 
  border-radius: 50%;
  height: 40px;
  width: 40px;
  margin-left: 20px;
  float: left;
}
.rotWord p {
  word-break: break-all;
  top: 4px;
  float: left;
  color: #fff;
  font-size: 14px;
  margin-left: 10px;
  padding: 10px;
  line-height: 24px;
  background: rgba(0, 0, 255, .5);
  border-radius: 6px;
  max-width: 220px;
}
.mWord span {
  background: url(../image/wo.png);
  background-size:100% 100%; 
  height: 40px;
  width: 40px;
  float: right;
  margin-right: 20px;
}
.mWord p {
  word-break: break-all;
  top: 2px;
  float: right;
  color: #fff;
  font-size: 14px;
  margin-right: 10px;
  padding: 10px;
  line-height: 24px;
  background: #19b955;
  border-radius: 6px;
  max-width: 220px;
}
.b-footer {
  width: 760px;
  height: 60px;
  margin: 0 20px;
  font-size: 16px;
  color: #666;
}
#f-left {
  padding-left: 20px;
  outline: none;
  overflow: hidden;
  width: 620px;
  height: 60px;
  float: left;
  background: rgba(225, 225, 225, .6);
  font-size: 18px;
  border: none;
  border-radius: 5px;
}
#btn {
  width: 100px;
  height: 60px;
  background: #666666;
  float: right;
  cursor: pointer;
  text-align: center;
  line-height: 60px;
  font-size: 18px;
  color: #fff;
  user-select: none;
  border-radius: 10px;
  cursor: pointer;
}