style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@500&display=swap');
@font-face {
    font-family: 'Digital7Italic';
    src:url('https://prwt888.github.io/calc-2023B5PS0968G/fonts/Digital7Italic.ttf') format('truetype');
  }
    
/* For tablets */
@media (max-width: 768px) {
    input {
        width: 280px;
        font-size: 48px;
    }

    button {
        width: 55px;
        height: 55px;
        font-size: 20px;
    }

    .calculator {
        margin-left: -150px;
        transform: scale(0.67);
    }
}

/* For mobile devices */
@media (max-width: 430px) {
    body {
        background-size: cover;
    }

    input {
        width: 200px;
        padding: 13px;
        font-size: 35px;
    }

    button {
        width: 35px;
        height: 10px;
        font-size: 18px;
    }

    .calculator {
        margin-left: 0;
        margin-top: 40px;
        transform: scale(0.67);
    }
}

/* Adding custom property for rotation */
@property --rotate {
  syntax: "<angle>";
  initial-value: 132deg;
  inherits: false;
}



body {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: url('https://i.postimg.cc/6p90RcQR/night-background.png') no-repeat center center fixed;
    background-size: 100% 100%;
}

.calculator {
    border: 3px solid transparent; /* Added for border glow effect */
    padding: 20px;
    border-radius: 25px;
    background: transparent;
    margin-left: 150px;
    margin-right:150px;
    margin-top: 20px;
    position: relative;
    box-shadow: 0px 3px 15px rgba(113, 115, 119, 0.5);
    transform: scale(0.75);
}

input {
    font-family: 'Digital7Italic', sans-serif;
    width: 350px;
    border: none;
    padding: 0px;
    margin: 10px;
    background: transparent;
    box-shadow: 0px 3px 15px rgba(84, 84, 84, 0.1);
    font-size: 55px;
    text-align: right;
    cursor: pointer;
    color: #ffffff;
}

input::placeholder {
    color: #ffffff;
}

button {
    font-family: 'Orbitron', sans-serif;
    border: none;
    width: 70px;
    height: 70px;
    margin: 10px;
    border-radius: 100%;
    background: transparent;
    color: #ffffff;
    font-size: 25px;
    box-shadow: -10px -10px 20px rgba(255, 255, 255, 0.1);
    cursor: pointer;
}
.equalBtn {
    background-color: #FF6B91;  /* Cherry tree pink */
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border: 2px solid transparent; /* Prepare for glowing effect */
}

.equalBtn:hover {
    box-shadow: 0 10px 20px rgba(255, 107, 145, 0.6); /* Matching shadow color with button */
}

/* Glowing circular border */
.equalBtn::before {
    content: "";
    position: absolute;
    top: -8%; 
    left: -8%;
    width: 116%;
    height: 116%;
    border-radius: 50%;
    background: rgba(255, 107, 145, 0.3); /* Glow effect */
    pointer-events: none;  /* Ensures the button remains clickable */
    z-index: -1;
}

.equalBtn:hover::before {
    opacity: 0.7;
    background: rgba(255, 107, 145, 0.5); /* Enhanced glow effect on hover */
}

.operator {
    color: #6dee0a;
}

/* Spinning light effect */
.calculator::before {
    content: "";
    width: calc(100% + 6px); /* Extended by the border width */
    height: calc(100% + 6px); /* Extended by the border width */
    border-radius: 19px; 
    background-image: linear-gradient(var(--rotate), #5ddcff, #3c67e3 43%, #4e00c2);
    position: absolute;
    z-index: -1;
    top: -3px; /* Offset by border width */
    left: -3px; /* Offset by border width */
    animation: spin 3s linear infinite;
}

@keyframes spin {
    0% {
        --rotate: 0deg;
    }
    100% {
        --rotate: 360deg;
    }
}