html, body {
    height: 100%;
}

body { 
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 0.5fr 1fr 0.5fr 0.5fr;
    gap: 40px;
}

body::before {
    content:'';
    background: url(./persistance-memory.jpg_large) no-repeat center ;
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.2;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

#timer {
    position: relative;
    grid-column: 2 / 3;
    grid-row: 2 / 3;
    height: 300px;
    width: 650px;
    margin: auto;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto minmax(0,0.75fr);
    gap: 5px;
    border: 10px solid black;
    border-radius: 150px;
    padding: 20px;
    background: rgba(128,128,128, 0.45);
}

#timer > * {
    margin: 0 auto;
}

#timer > h1 {
    grid-column: 1 / 4;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
}

#timer > #start {
    grid-column: 2 / 3;
    grid-row: 3 / 4;
    height: 50px;
    width: 150px;
    font-size: large;
    border-radius: 50px;
    margin: auto;
}

#values {
    position: relative;
    width: 550px;
    height: 100px;
    grid-column: 1 / span 3;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
}

#days, #hours, #minutes {
   margin: auto;
   height: 90px;
   background: rgba(128,0,0, 0.7);
   border: 5px solid rgb(255,102,102);
   border-radius: 30px;
   padding: 15px;
}

label {
    display: block;
    text-align: center;
    margin-bottom: 7px;
    font-size: x-large;
    font-family: Arial, Helvetica, sans-serif;
    color: white;
}

input {
    float: left;
    height: 30px;
    width: 80px;
    border-radius: 20px;
    text-align: center;
}

#display {
    grid-column: 2 / 3;
    grid-row: 3 / 4;
    padding: 10px;
    display: grid;
    grid-template-columns: 0.5fr 0.75fr 0.75fr 0.75fr 0.75fr 0.5fr;
    grid-template-rows: 1.75fr 1fr;
    width: 800px;
    height: 200px;
    background:rgba(128,128,128, 0.45);
    transform: perspective(10px) rotateX(2deg);
    margin: auto;
    border: 10px solid black;
    border-radius: 20px;
}

.display {
    margin: auto;
    font-size: larger;
    font-family: Georgia, 'Times New Roman', Times, serif;
    border: 5px solid black;
    background-color: white;
    padding: 10px;
    border-radius: 10px;
}

#display > h1 {
    text-align: center;
    font-size: 70px;
    font-family: Arial, Helvetica, sans-serif;
    grid-column: 1 / 7;
    margin: auto;
}

#day_display {
    grid-column: 2 / 3;
}