styles.css

*{
    box-sizing: border-box;
}
body{
    background-color: skyblue;
    font-family: sans-serif;
    margin: 0;
    padding: 0;
}
.container{
    background-color: white;
    min-height: 100px;
    width: 520px;
    margin: 100px auto;
    border-radius: 5px;
    height: auto;
}
.base{
    width: 100;
    margin: 0;
    overflow: hidden;
    display: block;
    float: none;
}
.base h4{
    font-size: 26px;
    text-align: center;
    font-family: sans-serif;
    margin-top: 0%;
    box-shadow: 0px 2px #bababa;
    font-weight: 800;
    color: navy;
    background: white;
    padding: 5px;
}
.block{
    width: 135px;
    padding: 5px 20px;
    margin-left: 20px;
    display: inline-block;
    float: left;
}
.title{
    font-size: 20px;
    text-align: left;
    font-family: sans-serif;
    font-weight: 600;
    letter-spacing: 0.6px;
    color: blue;
    word-spacing: 2.8px;
}
input[type=text]{
    width: 120px;
    margin: auto;
    outline: none;
    min-height: 50px;
    border: 1.5px solid black;
    border-radius: 2px;
    color: blue;
    font-size: 17px;
    padding: 12px;
}
input[type=text]:focus{
    background-color: whitesmoke;
    border: 2.5px solid yellow;
}
input[type=button]{
    width: 150px;
    margin-left:35%;
    margin-top: 40px;
    outline: none;
    border: none;
    border-radius: 2px;
    background-color: skyblue;
    padding: 12px 14px;
    color: white;
    font-size: 20px;
}
input[type=button]:hover{
    background-color: blue;
}
.age{
    display: block;
    margin: 10px;
    margin-top: 35px;
    padding-bottom: 20px;
    overflow: hidden;
    font-family: sans-serif;
    font-size: 23px;
    font-weight: 600;
    line-height: 1.5;
    word-spacing: 2.7px;
    color: navy;
    padding: 10px;
}