* {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
}

body {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.calculator {
    background-color: #202020;
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 25rem;
    height: 45rem;
    padding: 2px;
    border: 1px solid #372254;
}

.windows-options {
    color: #ffffff;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
}

.windows-options .opt-left {
    display: flex;
    gap: 1rem;
}

.windows-options .opt-right {
    display: flex;
    gap: 1rem;
}

.screen {
    height: 35%;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.screen .upper-toolbar {
    padding: 1rem;
    color: #666666;
    font-size: 20px;
    flex: 1;
    display: flex;
    justify-content: space-between;
}

.upper-toolbar .toolbar-left {
    width: 100%;
    display: flex;
    justify-content: left;
    align-items: center;
    align-self: flex-start;
    gap: 1rem;
}

.screen .lower-toolbar {
    padding: 1rem;
    color: white;
    display: flex;
    justify-content: space-between;
}

.lower-toolbar .option {
    color: #666666;
}

.screen .primary {
    background-color: #202020;
    color:  #ffffff;
    font-size: 70px;
    font-weight: 500;
    text-align: right;
    padding-right: 0.5rem;
    height: 5rem;
    border: none;
}

.screen .secondary {
    background-color: #202020;
    color:  #a6a6a6;
    font-size: 18px;
    text-align: right;
    padding-right: 1rem;
    height: 2rem;
    border: none;
}

.keypad {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.row {
    flex: 1;
    display: flex;
}

.buttons {
    margin: 2px;
    width: 100%;
    border: none;
    border-radius: 3px;
    background-color: #3b3b3b;
    color: #ffffff;
    font-size: 25px;
}


.buttons:hover {
    background-color: #323232;
}

.equal {
    background-color: #b290e2;
}

.equal:hover {
    background-color: #a082cb;
}

.disabled {
    background-color: #323232;
    color: #666666;
}