body{
    font-family: 'Poppins', sans-serif;
    line-height: 1.4;
    color: white;
    
    background-image: linear-gradient(115deg,rgba(58, 58, 158, 0.8),rgba(136, 136, 206, 0.7)),
        url(https://cdn.freecodecamp.org/testable-projects-fcc/images/survey-form-background.jpeg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;

    margin: auto;
    width: 100%;
    height: 100vh;
    
}

h1{
    font-weight: 400;
    line-height: 1.2;
}

p{
    font-size: 1.125rem;
}

h1,p{
    text-align: center;
    /* margin参数的顺序是上右下左 */
    margin:0 0 0.5rem 0;

}

form{
    max-width: 720px;
    min-width: 300px;
    width: 80vw;

    margin: 0 auto;
    padding:2rem 0;

    background-color: #212529AF;
}

fieldset{
    border: none;
    padding: 2rem 0;
    margin:0;
}

label{
    display: block;
    margin: 0.5rem 0;
}

input,textarea,select{
    display: block;
    width: 100%;
    min-height: 2em;
    padding: 0;
}

input[type="radio"],input[type="checkbox"]{
    display: inline;
    width: auto;
    margin: 0 0.5rem 0 0;
    vertical-align: middle;
}