html,
body,
#app,
.cover,
.cover_img,
.wrapper {
  width: 100%;
  height: 100%;
  min-height: 100%;
}
.cover_img {
  position: relative;
}
.cover_img img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}
.prompt {
  position: absolute ;
  top: 72%;
  left: 50%;
  margin-left: -2.2rem;
  font-size: .3rem;
  font-weight: 400;
  color: #FFFFFF;
}
.start {
  width: 5.76rem;
  height: .93rem;
  background: #FFFFFF;
  border-radius: .2rem;
  font-size: 0.4rem;
  background-color: white;
  text-align: center;
  line-height: .93rem;
  margin: 0 auto;
  font-size: .34rem;
  font-weight: 400;
  color: #891A1A;
  position: absolute;
  top: 63%;
  left: 50%;
  margin-left: -2.88rem;
}
.header {
  width: 100%;
  height: 1rem;
  background-color: #cc0000;
  text-align: center;
  font-size: 0.4rem;
  line-height: 1rem;
  color: white;
}
.flex {
  height: 1rem;
  background-color: white;
  width: 100%;
  display: flex;
  display: -webkit-flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 0.3rem;
}
.title i {
  font-style: normal;
  font-size: 0.34rem;
}
.title .curent {
  font-size: 0.34rem;
  font-weight: 400;
  color: #cc0000;
}
.title .total {
  font-size: 0.34rem;
  font-weight: 400;
  color: black;
}
.line {
  width: 100%;
  height: 0.3rem;
  background: #F0F1F5;
}
.multiple_choice {
  font-size: .34rem;
  font-weight: 500;
  color: #BC1025;
}
.content {
  padding: 0 0.3rem;
}
.content .subject {
  font-size: 0.34rem;
  padding-top: 0.4rem;
  line-height: 0.5rem;
  color: #000000;
}
.content .btn1 {
  width: 7rem;
  background-color: #6666661c;
  border-radius: .2rem;
  display: inline-block;
  padding: 0.2rem 0.2rem;
  word-break: break-word;
  margin: 1rem 0 0.4rem 0;
  line-height: 0.45rem;
  display: flex;
  display: -webkit-flex;
  align-items: center;
}
.content .btn1 img {
  width: .54rem;
  height: .54rem;
  display: block;
}
.content .btn1 p {
  width: 5.2rem;
  font-size: .34rem;
  font-weight: 400;
  color: #666666;
  line-height: 0.44rem;
  height: 100%;
}
.content .btn1 .options {
  width: 1rem;
  margin-left: 0.35rem;
}
.content .btn1 i {
  width: .54rem;
  height: .54rem;
  background: #F2F2F2;
  border: .01rem solid #878787;
  border-radius: 50%;
  font-size: .34rem;
  font-weight: bold;
  color: #333333;
  text-align: center;
  line-height: .54rem;
  font-style: normal;
  display: inline-block;
}
.content .btn2 {
  background-color: #6666661c;
  border-radius: .2rem;
  display: inline-block;
  padding: 0.2rem 0.2rem;
  word-break: break-word;
  line-height: 0.45rem;
  width: 7rem;
  display: flex;
  display: -webkit-flex;
  align-items: center;
}
.content .btn2 img {
  width: .54rem;
  height: .54rem;
  display: block;
}
.content .btn2 p {
  width: 5.2rem;
  font-size: .34rem;
  font-weight: 400;
  color: #666666;
  line-height: 0.44rem;
  height: 100%;
}
.content .btn2 .options {
  width: 1rem;
  margin-left: 0.35rem;
}
.content .btn2 i {
  width: .54rem;
  height: .54rem;
  background: #F2F2F2;
  border: .01rem solid #878787;
  border-radius: 50%;
  font-size: .34rem;
  font-weight: bold;
  color: #333333;
  text-align: center;
  line-height: .54rem;
  font-style: normal;
  display: inline-block;
}
.content .btn3,
.content .btn4,
.content .btn5 {
  width: 7rem;
  text-align: center;
  height: .93rem;
  background: #BC1025;
  border-radius: .2rem;
  line-height: 0.93rem;
  font-size: 0.3rem;
  color: white;
  margin-top: 0.5rem;
  font-size: .34rem;
  font-weight: 400;
  color: #FFFFFF;
  outline: none;
  border: 0;
}
.content .active {
  background-color: #62C993;
}
.content .danger {
  background: #BC1025;
}
.content .btn4 {
  margin-bottom: .5rem;
}
.correct {
  border: 1px solid #62C993;
  border-radius: .2rem;
}
.error {
  border: 1px solid #999999;
  border-radius: .2rem;
}
.end_cover {
  width: 100%;
  height: 100%;
  background: url(../images/end.png) no-repeat center;
  background-size: cover;
  position: relative;
}
.box_end {
  width: 100%;
  color: white;
  position: absolute;
  top: 38%;
  text-align: center;
}
.box_end .score {
  font-size: 1.81rem;
  font-weight: bold;
  color: #FFFFFF;
}
.box_end .score span {
  font-size: .44rem;
  font-weight: bold;
  color: #FFFFFF;
}
.box_end .txt {
  font-size: .3rem;
  font-weight: 400;
  color: #FFFFFF;
  margin-top: 0.2rem;
  letter-spacing: 0.07rem;
}
.box_end .answer_btn {
  width: 5.76rem;
  height: .93rem;
  background: #FFFFFF;
  border-radius: .2rem;
  font-size: .34rem;
  font-weight: 400;
  color: #891A1A;
  text-align: center;
  line-height: .93rem;
  margin: 0 auto;
  margin-top: 1.1rem;
}
@media screen and (min-width: 750px) {
  html,
  body,
  #app,
  .cover,
  .cover_img,
  .wrapper {
    width: 100%;
    height: 100%;
    min-height: 100%;
  }
  .subject {
    text-align: center;
  }
  .btn1,
  .btn2,
  .btn3,
  .btn4,
  .btn5 {
    display: block;
    margin: 100px auto !important;
  }
  .cover_img {
    position: relative;
  }
  .cover_img img {
    width: 750px;
    height: 100%;
    display: block;
    object-fit: contain;
    margin: 0 auto;
  }
  .prompt {
    position: absolute ;
    top: 78%;
    left: 50%;
    margin-left: -220px;
    font-size: 30px;
    font-weight: 400;
    color: #FFFFFF;
  }
  .start {
    width: 440px;
    height: 93px;
    background: #FFFFFF;
    border-radius: 20px;
    font-size: 40px;
    background-color: white;
    text-align: center;
    line-height: 93px;
    margin: 0 auto;
    font-size: 34px;
    font-weight: 400;
    color: #891A1A;
    position: absolute;
    top: 63%;
    left: 50%;
    margin-left: -220px;
  }
  .header {
    width: 100%;
    height: 100px;
    background-color: #cc0000;
    text-align: center;
    font-size: 40px;
    line-height: 100px;
    color: white;
  }
  .flex {
    height: 100px;
    background-color: white;
    width: 100%;
    display: flex;
    display: -webkit-flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
  }
  .title i {
    font-style: normal;
    font-size: 34px;
  }
  .title .curent {
    font-size: 34px;
    font-weight: 400;
    color: #cc0000;
  }
  .title .total {
    font-size: 34px;
    font-weight: 400;
    color: black;
  }
  .line {
    width: 100%;
    height: 30px;
    background: #F0F1F5;
  }
  .multiple_choice {
    font-size: 34px;
    font-weight: 500;
    color: #BC1025;
  }
  .content {
    padding: 0 30px;
  }
  .content .subject {
    font-size: 34px;
    padding-top: 40px;
    line-height: 50px;
    color: #000000;
  }
  .content .btn1 {
    width: 700px;
    background-color: #6666661c;
    border-radius: 20px;
    display: inline-block;
    padding: 20px 20px;
    word-break: break-word;
    margin: 100px 0 40px 0;
    line-height: 45px;
    display: flex;
    display: -webkit-flex;
    align-items: center;
  }
  .content .btn1 img {
    width: 54px;
    height: 54px;
    display: block;
  }
  .content .btn1 p {
    width: 520px;
    font-size: 30px;
    font-weight: 400;
    color: #666666;
    line-height: 44px;
    height: 100%;
  }
  .content .btn1 .options {
    width: 100px;
    margin-left: 35px;
  }
  .content .btn1 i {
    width: 54px;
    height: 54px;
    background: #F2F2F2;
    border: 1px solid #878787;
    border-radius: 50%;
    font-size: 34px;
    font-weight: bold;
    color: #333333;
    text-align: center;
    line-height: 54px;
    font-style: normal;
    display: inline-block;
  }
  .content .btn2 {
    background-color: #6666661c;
    border-radius: 20px;
    display: inline-block;
    padding: 20px 20px;
    word-break: break-word;
    line-height: 45px;
    width: 700px;
    display: flex;
    display: -webkit-flex;
    align-items: center;
  }
  .content .btn2 img {
    width: 54px;
    height: 54px;
    display: block;
  }
  .content .btn2 p {
    width: 520px;
    font-size: 30px;
    font-weight: 400;
    color: #666666;
    line-height: 44px;
    height: 100%;
  }
  .content .btn2 .options {
    width: 100px;
    margin-left: 35px;
  }
  .content .btn2 i {
    width: 54px;
    height: 54px;
    background: #F2F2F2;
    border: 1px solid #878787;
    border-radius: 50%;
    font-size: 34px;
    font-weight: bold;
    color: #333333;
    text-align: center;
    line-height: 54px;
    font-style: normal;
    display: inline-block;
  }
  .content .btn3,
  .content .btn4,
  .content .btn5 {
    width: 700px;
    text-align: center;
    height: 93px;
    background: #BC1025;
    border-radius: 20px;
    line-height: 93px;
    font-size: 30px;
    color: white;
    margin-top: 50px;
    font-size: 34px;
    font-weight: 400;
    color: #FFFFFF;
    outline: none;
    border: 0;
  }
  .content .active {
    background-color: #62C993;
  }
  .content .danger {
    background: #BC1025;
  }
  .content .btn4 {
    margin-bottom: 50px;
  }
  .correct {
    border: .01rem solid #62C993;
    border-radius: 20px;
  }
  .error {
    border: .01rem solid #999999;
    border-radius: 20px;
  }
  .end_cover {
    width: 750px;
    height: 100%;
    background: url(../images/end.png) no-repeat center;
    background-size: contain;
    position: relative;
    margin: 0 auto;
  }
  .box_end {
    width: 100%;
    color: white;
    position: absolute;
    top: 38%;
    text-align: center;
  }
  .box_end .score {
    font-size: 120px;
    font-weight: bold;
    color: #FFFFFF;
  }
  .box_end .score span {
    font-size: 44px;
    font-weight: bold;
    color: #FFFFFF;
  }
  .box_end .txt {
    font-size: 20px;
    font-weight: 400;
    color: #FFFFFF;
    margin-top: 20px;
    letter-spacing: 7px;
  }
  .box_end .answer_btn {
    width: 440px;
    height: 93px;
    background: #FFFFFF;
    border-radius: 20px;
    font-size: 34px;
    font-weight: 400;
    color: #891A1A;
    text-align: center;
    line-height: 93px;
    margin: 0 auto;
    margin-top: 110px;
  }
}