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

body {
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex-grow: 1;
}

.content {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

h1 {
    text-align: center;
    padding: 20px;
}

#calculator-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 375px;
    height: 550px;
    border-radius: 10px;
    gap: 10px;
    padding: 15px 15px;
    background-color: #2e495b;
}

#calculator-screen, #calculator-buttons {
    width: 345px;
    border-radius: 10px;
}

#calculator-screen {
    height: 20%;
    padding: 5px;
    background-color: white;
    color: black;
    font-size: 40px;
    display: flex;
    justify-content: end;
    align-items: end;
}

#calculator-buttons {
    height: 80%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn-row {
    height: 22%;
    display: flex;
    gap: 10px;
    
}

.btn {
    border-radius: 10px;
    flex: 1;
    background-color: #5D7881;
    color: white;
    border: none;
    font-size: 22px;
}

.btn:hover {
    background-color: #6090a0;
}

#zero {
    flex: 2.15;
}

#clear {
    background-color: #C01E2D;
    color: white;
}

#clear:hover {
    background-color: #d13646;
}