style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Ubuntu', sans-serif;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-image: linear-gradient(to right, #00b09b, #96c93d);
    color: white;
}

.container{
    width: 50%;
    height: 80%;
}

.container .main-content .control{
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-family: 'Ubuntu', sans-serif;
    text-shadow: 0 0 1px;
}

.container .heading{
    width: 80% ;
    margin: 30px auto;
    text-align: center;
    padding: 5px 10px;
    text-shadow: 0 0 5px;
    font-family: 'Ubuntu', sans-serif;
}

.container .main-content .control > select{
    height: 30px;
    width: 115px;
    border-radius: 5px;
    font-size: 1rem;
    font-family: 'Ubuntu', sans-serif;
    box-shadow: 0 0 5px black;
}

.container .button-area{
    padding: 20px;
    text-align: center;
}

.container .button-area >button{
    font-size: 1.2rem;
    padding: 6px 10px;
    border-radius: 5px;
    border: none;
    background: transparent;
    border: 2px solid white;
    color: white;
    box-shadow: 0 0 5px;
    font-family: 'Ubuntu', sans-serif;

}

.container .button-area >button:hover{
    background-color: white;
    color: black;
}

.container .final{
    text-align: center;
    padding: 10px;
    font-family: 'Ubuntu', sans-serif;
    text-shadow: 0 0 2px;
}

@media only screen and (min-width:320px) and (max-width:480px) {
    .container {
    width: 85%;
    height: 80%;
    }
}

@media only screen and (min-width:480px) and (max-width:595px) {
    .container {
    width: 75%;
    height: 80%;
    }
}

@media only screen and (min-width:595px) and (max-width:690px) {
    .container {
    width: 65%;
    height: 80%;
    }
}

@media only screen and (min-width:690px) and (max-width:800px) {
    .container {
    width: 55%;
    height: 80%;
    }
}

@media only screen and (min-width:800px) and (max-width:1024px) {
    .container {
    width: 45%;
    height: 80%;
    }
}

@media only screen and (min-width:1024px) and (max-width:1224px) {
    .container {
    width: 40%;
    height: 80%;
    }
}

@media only screen and (min-width:1224px) and (max-width:2000px) {
    .container {
    width: 30%;
    height: 80%;
    }
}