:root {
  /* Global variables */
  --doddle-gray: #444444;
  --doddle-font: "Roboto", sans-serif;
  --doddle-orange: #ff6600;
  --doddle-white: #ffffff;
}

body {
  color: var(--doddle-gray);
  font-family: var(--doddle-font);
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

.main {
  background-color: var(--doddle-gray);
  border-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 20px 0;
  min-height: 100vh;
}

.content {
  text-align: center;
  position: relative;
  padding: 10px;
}

.interface button i {
  font-size: 2.5rem;
  font-weight: bold;
}

.interface button {
  background-color: var(--doddle-orange);
  border-radius: 10px;
  border-style: none;
  color: var(--doddle-white);
  font-size: 1.5rem;
  font-weight: bold;
  width: 80px;
  height: 50px;
  margin-left: 10px;
  margin-top: 10px;
  transition: 0.1s;
  text-transform: capitalize;
  box-shadow: 3px 3px 3px 3px black;
}

.interface button:hover {
  background-color: var(--doddle-gray);
  cursor: pointer;
  box-shadow: 0px 0px 0px 0px;
  border: 1px solid black;
}

.interface {
  display: flex;
  justify-content: flex-end;
}

.screen {
  background-color: var(--doddle-white);
  border-radius: 10px;
  padding: 50px 50px 25px 50px;
  margin: 5px auto;
  text-transform: capitalize;
}

.help-text {
  background-color: var(--doddle-white);
  color: var(--doddle-orange);
  border-style: solid;
  border-width: 3px;
  border-color: var(--doddle-gray);
  border-radius: 5px;
  bottom: 20vh;
  right: 5vw;
  width: 25rem;
  box-shadow: 5px 5px 5px 5px black;
  font-family: var(--doddle-font);
  font-size: 1.5rem;
}

.help-text p {
  margin: 10px;
}

.startPanel {
  background-color: var(--doddle-white);
  border-radius: 5px;
  border-color: var(--doddle-gray);
  border-width: 3px;
  border-style: solid;
  font-size: 1.5rem;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 100px;
  box-shadow: 10px 10px 10px 0px black;
}

.startPanel p {
  margin: 100px;
}

.intro img {
  width: 600px;
}

.heading {
  color: var(--doddle-gray);
  text-align: center;
}

.intro,
.help-text,
.startPanel {
  position: absolute;
}

/* Content_________________________________________________________________ */

.addition-table {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 50px;
}

.second {
  z-index: 3;
  font-size: 1.5rem;
  color: navy;
  text-transform: lowercase;
  font-weight: 500;
  transform: translateY(150%);
}

.description {
  display: flex;
  flex-direction: column;
  align-self: center;
  align-items: center;
  justify-items: center;
  padding-right: 25px;
}

.description p {
  margin: 0;
  font-size: 1.5rem;
  color: navy;
  text-transform: lowercase;
  font-weight: 500
}

.addition-table table {
  border-collapse: collapse;
  width: 100%;
}

.addition-table td {
  border: 2px solid navy;
  font-size: 1.8rem;
  cursor: pointer;
  color: black;
  width: 10%;
  height: 4vw;
}

.addition-table td:hover {
  background-color: rgba(4, 4, 4, 0.2);
}

tr:nth-child(1),
td:nth-child(1) {
  background-color: rgb(217, 217, 252);
}

.turquoise {
  background-color: cornflowerblue;
}

.skyblue {
  background-color: cyan;
}

.tomato {
  background-color: salmon;
}

hide {
  visibility: hidden;
}