.calculator {
    position: relative;
    width: 350px;
    background-color: #EDA7C1;
    padding: 25px 20px;
    border-radius: 20px;
    transition: all .2s;
}
.screen {
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    width: 350px;
    height: 100px;
    border-radius: 15px;
    background-color: #C0B5AB;
    padding-left: 20px;
    box-shadow: inset 0 0 10px #ee90b3;
    padding-right: 20px;
    padding-bottom: 5px;
}

.screen-input {
    display: inline;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    background-color: transparent;
    outline: none;
    border: none;
    border-radius: 20px;
    font-size: 34px;
}

@media screen and (max-width: 400px) {
    .calculator {
        width: 100%;
        height: 100%;
        border-radius: 0;
    }
    .screen {
        width: 100%;
        height: 100px;
    }
    .screen-input {
        font-size: 28px;
    }
    
}