style.css

* {
    box-sizing: border-box;
   }
   
body{
    font-family: Arial, Helvetica, sans-serif;
    background-color: #eee;
    font-size: 15px;
    line-height: 1.5;
    padding: 0;
    margin: 0;
   }
   
.container{
    width:520px;
    height: auto;
    min-height:100px;
    margin: 100px auto;
    background-color: #ffffff;
    border-radius: 5px;
   }

.block{
 width: 135px;
 padding: 5px 20px;
 margin-left: 20px;
 display: inline-block;
 float: none;
}

.title{
 font-size: 20px;
 text-align: center;
 font-family: sans-serif;
 font-weight: normal;
 line-height: 0.5;
 letter-spacing: 0.5px;
 word-spacing: 2.7px;
 color: #0d0d0e;
}

input[type=text] {
 width: 140px;
 margin: auto;
 outline: none;
 min-height: 50px;
 border: 2px solid #121213;
 padding: 12px;
 background-color: #ffffff;
 border-radius: 2px;
 color: #1073d0;
 font-size: 32px;
}

input[type=text]:focus{
 background-color: #ffffff;
 border: 2px solid orange;
 outline: none;
}
input[type=button]{
    width: 150px;
    margin-left: 35%;
    margin-top: 40px;
    outline: none;
    border: none;
    border-radius: 2px;
    background-color: #0761b6;
    color: #ffffff;
    padding: 14px 16px;
    text-align: center;
    font-size: 16px;
   }
   
input[type=button]:hover{
    background-color: #003669;
}

#age{
    text-align: center;
    font-size: 32px;
}