style.css

@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@300;400;500&display=swap');


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

body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #091921;
}

body::before{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(#e91e63,#ffc107);
    clip-path: circle(22% at 30% 20%);
}

body::after{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(#ffffff,#da00ff);
    clip-path: circle(20% at 70% 90%);
}

.container{
    position: relative;
    background: rgba(255,255,255,0.05);
    border-radius: 6px;
    overflow: hidden;
    z-index: 10;
    backdrop-filter: blur(15px);
    border-top: 1px solid rgba(255,255,255,0.2);
    border-left: 1px solid rgba(255,255,255,0.2);
    box-shadow: 5px 5px 30px rgba(0,0,0,0.2);
}

.container .calculator{
    position: relative;
    display: grid;
}

.container .calculator .value{
    grid-column: span 4;
    height: 140px;
    width:300px;
    text-align:right;
    border:none;
    outline:none;
    padding: 10px;
    font-size: 30px;
    background:transparent;
    color: #fff;

    border-bottom: 1px solid rgba(255,255,255,0.05);
    border-right: 1px solid rgba(255,255,255,0.05);
}

.container .calculator span{
    display: grid;
    place-items:center;
    height:75px;
    width:75px;
    color:#fff;
    font-weight: 400px;
    cursor:pointer;
    font-size:20px;
    user-select:none;

border-bottom: 1px solid rgba(255,255,255,0.05);
    border-right: 1px solid rgba(255,255,255,0.05);
    transition: 0.5s
}

.container .calculator span:hover{
    transition:0s;
    background:rgba(255,255,255,0.05)
}

.container .calculator span:active{
    background:#14ff47;
    color: #192f00;
    font-size:24px;
    font-weight:500;
}

.container .calculator .clear{
    grid-column: span 2;
    width:150px;
    background: rgba(255,255,255,0.05);
}

.container .calculator .plus{
    grid-row: span 2;
    height:150px;
}

.equal{
    background: rgba(255,255,255,0.05);
}