style.css

@import url('https://fonts.googleapis.com/css2?family=Barriecito&display=swap');
* {
    margin: 0;
    padding: 0;
    font-family: 'Barriecito', cursive;
}
.container {
    width: auto !important; /* makes it responsive */
    height: auto !important;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 90vh;
}
h1 {
    margin-bottom: 2vh;
}
input {
    margin: 1vh;
}
input[type=text] {
    font-size: 20px;
    padding: 10px 20px;
    border: 1px solid black;
    outline: none;
    border-radius: 5px;
    width: 30vw;
}
button {
    font-size: 15px;
    padding: 5px 10px;
    width: 30vw;
    background: #4CAF50;
    border: none;
    outline: none;
    font-weight: 600;
    color: white;
    transition: 0.4s;
    cursor: pointer;
    margin: 1vh;
    border-radius: 5px;
}
button:hover {
    border: 1px solid #4CAF50;
    background-color: transparent;
    color: #4CAF50;
    transform: scale(1.03);
}
@media only screen and (max-width:600px){
    input[type=text] {
        width: 68vw;
    }
    button {
        width: 60vw;
    }
}