*{
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
}
.main{
    width: 100vw;
    height: 100vh;
    background-color: #93a4a9;
    display: flex;
    align-items: center;
    justify-content: center;
}
.calc{
    width: 25%;
    min-width: 250px;
    height: auto;
    padding: 20px;
    background: #43454d;
    border-radius: 10px;
    box-shadow: 5px 10px 20px rgba(0,0,0,0.8);
    display: flex;
    flex-direction: column;

}
.display{
    padding: 2% 5%;
    width: 100%;
    height: 60px;
    background: #ffff;
    /* border: none; */
    outline: none;
    margin-bottom: 20px;
    font-size: 20px;
    border-radius: 5px;
    overflow-x: auto;
    text-align: right;
}
.buttons{
    display: grid;
    grid-template-columns: repeat(4,1fr);
    grid-gap: 10px;
}
button{
    font-size: 100%;
    font-weight: 700;
    padding: 20% 10% ;
    background: #bebcbc;
    border: none;
    border-radius: 20px;
    box-shadow:  0px 0px 3px;
}
.operator{
    background: #9497b5;
}
button:hover{
    background: #ffffff;
}