style.css

*{
    box-sizing: content-box;
}

body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    margin:15px 30px;
    font-size: 17px;
    padding: 8px;
}

.container {
    background-color: #f2f2f2;
    padding: 5px 20px 15px 20px;
    border-radius: 8px;
    border: 1px solid lightgrey;
}

input[type="text"],
input[type="email"] ,
input[type="number"] ,
input[type="password"], 
input[type="date"],
select,
textarea{
    padding:12px;
    width:97%;
    border: 1px solid lightgrey;
    border-radius: 8px;
    margin: 10px;
}

fieldset{
    background-color:#fff;
    border: 1px solid lightgrey;
}

.main_heading{
    text-align:center;
}

input[type="submit"]{
    background-color:#59ac15;
    width:97%;
    color:white;
    padding:12px 20px;
    cursor: pointer;
    border:none;
    border-radius: 4px;
}

input[type="submit"]:hover{
    background-color:orange;
    
}