style.css

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

body 
{
    display: flex; 
    justify-content: center; 
    align-items: center; 
    min-height: 100vh; 
    background: #091921; 
}
/* دایره بزرگ */
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%);
}
/* دایره کوچک */
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); 
}
/* ماشین حساب */
.container .calculator
{
    position: relative;
    display: grid;
}

.container .calculator .value
{
    grid-column: span 4;
    height: 140px;
    width: 300px;
    text-align: right;
    border: 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);
}
/* دکمه ها */
.container .calculator span
{
    display: grid;
    place-items: center;
    width: 75px;
    height: 75px;
    color: #fff;
    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: 0.5%;
}

.container .calculator span:hover
{
    transition: 0%;
    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);
}