style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&family=Saira:wght@700&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    
}


body{
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #e0e3eb;
}

.container{
    display: grid;
   /* position: relative;*/
    max-width: 300px;
    width: 100%;
    height: 600px;
    border-radius: 12px;
    padding: 10px 20px 20px;
    background: #fff;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.05);
}

.display{
    height: 80px;
    width: 100%;
    outline: none;
    border: none;
    text-align: right;
    margin-bottom: 10px;
    font-size: 25px;
    color: #000e1a;
    pointer-events: none;
    background-color: blue;
    border-radius: 8px;
    padding: 20px;
}

.buttons{
    display: grid;
    grid-gap: 10px;
    grid-template-columns: repeat(4,1fr);
}

.buttons button{
    padding: 10px;
    border-radius: 6px;
    border: none;
    font-size: 20px;
    cursor: pointer;
    background-color: #eee;
    transition: all 0.3s ease;
}

.buttons button:hover{
    background: yellow;
}

.span-two{
    grid-column: span 2;
}