html {
width: 100%;
height: 100%;
font-size:18px;
background-color: #ffdab97c;
}

.main{
display: inline-block;
width:100%;
height:30px;
font-size:200%;
}

.center{
text-align: center;    
}
.top{
    font-size:200%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.ans{
    height:100px;
    margin-top:2%;
}

.content{
    padding-top: 5%;
}

.number{
width: 8%;
height: 50%;
background-color:#fff;
font-size: 150%;


}
.text{
    display: inline;
}
.time{
    margin-left: 30%;
    font-size: 150%;
}


.button {
    position: relative;
    background-color: #4CAF50;
    border: none;
    font-size: 28px;
    color: #FFFFFF;
    padding: 20px;
    width: 200px;
    text-align: center;
    -webkit-transition-duration: 0.4s; /* Safari */
    transition-duration: 0.4s;
    text-decoration: none;
    overflow: hidden;
    cursor: pointer;
    margin-left:43.5%;
    margin-top:0;
  }
  .button:hover{
    text-shadow: 2px 2px 5px red;
  }
  .button:after {
    content: "";
    background: #90EE90;
    display: block;
    position: absolute;
    padding-top: 300%;
    padding-left: 350%;
    margin-left: -20px!important;
    margin-top: -120%;
    opacity: 0;
    transition: all 0.8s
  }
  
  .button:active:after {
    padding: 0;
    margin: 0;
    opacity: 1;
    transition: 0s
  }