*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html{
    font-size: 15px;
}
.container{
    width: 100%;
    height: 100vh;
    max-width: 1150px;
    margin: 0 auto;
    background: linear-gradient(90deg, rgba(0, 0, 0, 0.604),rgba(0, 0, 0, 0.596)), url("./images/bmi.jpg") center no-repeat fixed;
    background-size: cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/************************
 Styling main Calculator
************************/

.calculator{
    width: 50%;
    min-width: 40%;
    padding: .5em 1em;
    background-color: rgba(0,0,0,.3);
    box-shadow: 0px 0px 10px 1px white;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* styling header */
header>h1{
    padding: .3em .5em;
    font-size: 1.7rem;
    font-family: Arial, Helvetica, sans-serif;
    letter-spacing: 1.2px; word-spacing: 4px;
    color:white;
    text-shadow: 1px 0px 10px hotpink;
    text-align: center;
}


/* styling form and its eleemnts */
form{
    display: flex;
    flex-direction: column;
    margin-top: 1em;
    width: 80%;
    min-width: 60%;
    min-height: 50vh;
    padding: .5em 1em;
}
form label{
    color: rgb(221, 94, 115);
    letter-spacing: 1px;
    font-size: 1.1rem;
    font-weight: 400;
    font-family: cursive;
    margin: .6em 0;
}
form input{
    width: 100%;
    padding: .7em;
    border: 2px solid black;
    border-radius: 5px;
    font-family: cursive;
    text-align: center;
}
/* button */
.btn{
    margin: 1.5em auto;
    margin-top: 1.5em;
    padding: .3em .7em;
    text-decoration: none;
    color: rgb(212, 88, 150);
    font-size: 1.1rem;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-weight: 100;
    border: 2px solid rgb(245, 243, 243);
    border-radius: 3px;
    letter-spacing: 2px;
}
/* footer */
footer{
    background-color: rgb(231, 149, 207);
    width: 100%;
    margin-top: .4em;
    padding: .3em 0;
    word-spacing: 3px;
    text-align: center;
}


/* //making of responsive design */
@media screen and (max-width:700px){
    .calculator{
        width: 70%;
    }
}
@media screen and (max-width:400px){
    .calculator{
        width: 80%;
    }
    form{
        width: 100%;
    }
    form input{
        width: 90%;
    }
}