style.css

*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
}

body {
    font-family: sans-serif;
    background-color: #233142;
}

.container {
    width: 100%;
    height: 100%;
   
}

.signup {
    width: 40%;
    display: block;
    margin: 50px auto;
    padding: 50px 35px;
    background-color: #fff;
}

h1 {
    text-align: center;
    text-transform: uppercase;
    color: #ff6f3c;
    margin-bottom: 10px;
}

h3 {
    text-align: center;
    padding-bottom: 30px;
    font-weight: 500;
}

a {
    text-decoration: none;
    color: #ff6f3c;
    padding-bottom: 30px;
}

p {
    text-align: center;
    color: #fff;
}

form {
    display: grid;
}

label {
    color: #000;
    font-size: 18px;
    font-weight: 500;
}

input {
    padding: 10px;
    border-radius: 8px;
    margin-top: 2px;
    margin-bottom: 12px;
    font-size: 16px;
    border: solid 1px rgb(245, 245, 245);
}

.button {
    background-color: #ff6f3c;
    width: 30%;
    margin: auto;
    border: none;
    color: #fff;
    text-transform: uppercase;
    font-weight: 600;
    padding: 15px 15px;
    margin-top: 30px;
    cursor: pointer;
}

@media (max-width: 768px){
    .signup{
        width: 90%;
    }
    

}

@media (max-width: 300px) {

    input {
        width: 90%;
    }
}