style.css

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

body {
    background-image: url(temp2.jpeg);
    width: 100vw;
    height: 100vh;
    background-color: #cccccc;
    display: grid;
    place-items: center;
}

form {
    background-color: rgb(151 155 88);
    padding: 80px;

    margin: 100px auto;
    text-align: center;
    box-shadow: 0 10px 6px -6px rgb(0, 0, 0);
}

#tempCalc label {
    font-size: 30px;
}

#temp {
    border: 12px;
    padding: 10px;
    height: 40px;
    width: 100px;
    font-size: 20px;
    margin-top: 20px;
}

#temp_diff {
    height: 40px;
    border: 12px;
    margin-top: 20px;
    font-size: 15px;
    vertical-align: top;
}

.button {
    cursor: pointer;
    margin-top: 20px;
    font-style: bold;
    border-radius: 12px;
    font-size: 16px;
    background-color: rgb(233, 162, 9);
    height: 35px;
    width: 115px;
}