*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
body,html{
    width:100%;
    height: 400px;
    background-image: url(https://wallpaperaccess.com/full/1540030.jpg);
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background-attachment: fixed;
}

.container{
    text-align: center;
    color:black;
    position: absolute;
    font-size: 2em;
    font-family: Arial, Helvetica, sans-serif;
    top:25%;
    left:25%;
    transform: translateX(-50%),translateY(-50%);
    background-color:#67E6DC;
    border-radius: 3.5%;
    padding: 20px;
    width: 50%;
}
.input input[type=number]{
    width: 30%;
    padding: 15px 20px;
    margin: 8px 0;
    box-sizing: border-box;
    border-radius: 20px;
}
.dropdown select[name=conversionType]{
    width: 50%;
    padding: 15px 20px;
    margin: 10px 0;
    box-sizing: border-box;
    border-radius: 20px;
}
.button button[type=button]{
    width: 35%;
    padding: 10px 20px;
    margin: 10px 0;
    box-sizing: border-box;
    border-radius: 20px;
    background-color:#45CE30;
    border: none;
    color: black;
    text-align: center;
    font-size: 16px;
    margin: 4px 2px;
    transition: 0.3s;
}

.button button[type=button]:hover{
    background-color:#E74292;
    color: white;
}

/* Media queries */

@media only screen and (max-width : 600px) {
    body,html{
        background-size: cover;
        height: auto;
    }
   .container{
        top: 30%;
        left:45px;
        width: 80%;
        font-size: 1.2em;
        padding: 10px;
   }
   .input input[type=number] {
    width: 80%;
    padding: 10px;
    }
    .dropdown select[name=conversionType] {
        width: 80%;
        padding: 10px;
    }
    .button button[type=button] {
        width: 80%;
        padding: 10px;
        font-size: 14px;
        margin-inline: 0;
    }
}