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;
   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;
}