html {
    box-sizing: border-box;
    font-size: 10px;
    background: #8E24AA;
    background: linear-gradient(45deg, #42a5f5 0%, #478ed1 50%, #0d47a1 100%);
}

*,
*:before,
*:after {
    box-sizing: inherit;
}

body {
    margin: 0;
    text-align: center;
    font-family: 'Inconsolata', monospace;
}

.display__time-left {
    font-weight: 100;
    font-size: 20rem;
    margin: 0;
    color: white;
    text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.05);
}

.timer {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
}

.timer__controls {
    display: flex;
}

.timer__controls>* {
    flex: 1;
}

.timer__controls form {
    flex: 1;
    display: flex;
}

.timer__controls input {
    flex: 1;
    border: 0;
    padding: 2rem;
}

.timer__button {
    background: none;
    border: 0;
    cursor: pointer;
    color: white;
    font-size: 2rem;
    text-transform: uppercase;
    background: rgba(0, 0, 0, 0.1);
    border-bottom: 3px solid rgba(0, 0, 0, 0.2);
    border-right: 1px solid rgba(0, 0, 0, 0.2);
    padding: 1rem;
    font-family: 'Inconsolata', monospace;
}

.timer__button:hover,
.timer__button:focus {
    background: rgba(0, 0, 0, 0.2);
    outline: 0;
}

.display {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.display__end-time {
    font-size: 4rem;
    color: white;
}