style.css

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

body {
    font-family: Arial, sans-serif;
    background-color: #333;
    text-align: center;
    display: grid;
    place-content: center;
    min-height: 100svh;
}

.calculator {
    background-color: #fff;
    background-color: gray;
    color: #fff;
    border-radius: 10px;
    margin: 20px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    min-height: 75svh;
}

.header {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}


.mode-switch {
	align-self: flex-end;
}

.mode-switch label {
	cursor: pointer;
}

input[type='checkbox'] {
	visibility: hidden;
}

main {
	height: 75%;
	display: grid;
	place-content: center;
}

#current-time{
	display: flex;
	flex-direction: column;
	gap: 1rem;
	margin-bottom: 10px;
}

.options,
.input-section,
.calculate-button {
	margin: 20px 0;
}

select,input,button{
	padding: 10px;
	border-radius: .5rem;
}

.result {
    margin: 20px 0;
}

#time-remaining {
    font-weight: bold;
}

.light-mode {
    background-color: #f0f0f0;
    color: #000;
}