style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&family=Ubuntu:wght@400;500;700&display=swap');
@import url("https://fonts.googleapis.com/css2?family=Titan+One&display=swap");
body{
    background-color: rgb(0, 0, 0);
}
h1{
    color:rgb(0, 248, 37);
}
.container {
    max-width: 500px;
    height: 100px;
    margin: 10px auto 0 auto;
    box-shadow: 0px 0px 43px 17px rgb(0, 0, 0);
    background-color: black;
    opacity: 0.8;
}
#calculate {
    text-align: right;
    height: 70px;
    line-height: 70px;
    padding: 16px 8px;
    font-size: 25px;
    font-weight: 900;
    font-family: 'Ubuntu', sans-serif;
    color: aliceblue;
}
.buttons {
    display: grid;
    border-bottom: 3px solid rgb(255, 255, 255);
    border-left: 3px solidrgb(255, 255, 255);
    grid-template-columns: 1fr 1fr 1fr 1fr;
    padding: 10px 10px 10px 10px;
}
.button {
    border: 0.5px solid rgb(16, 4, 255);
    line-height: 100px;
    text-align: center;
    font-size: 25px;
    color: aliceblue;
    font-weight: 900;
    cursor: pointer;
    border-radius: 50%;
    font-family: 'Ubuntu', sans-serif;
    padding: 5px 5px 5px 5px;
    transition: transform 0.5s;
   
}
.button2{
    color: red;
    border: 5px solid rgb(255, 255, 255);
    line-height: 100px;
    text-align: center;
    font-size: 25px;
    font-weight: 900;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    cursor: pointer;
    border-radius: 50%;
}
.button2:hover{
    color: rgb(255, 255, 255);
    background: red;
    transition: 0.5s ease-in-out;

}
#equal {
    background-color: rgb(0, 255, 0);
    color: rgb(248, 247, 247);
}
#equal:hover{
    background: rgb(3, 114, 3);
    transition: 0.5s ease-in-out;
    color: black;
    font-size: 35px;
}
.button:hover {
    background-color: #000000;
    color: white;
    transition: 0.5s ease-in-out;
    transform: translateY(-5px);
}