:root {
  --main-bg-color: #d1d1d1;
  --gray: #262626;
  --empty-box: #d1d1d1;
  --filled-box: #d1d1d1;
}

body {
  background: var(--main-bg-color);

  font-size: large;
  font-weight: bolder;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif, sans-serif;
}

.title {
  display: flex;
  justify-content: center;
  align-content: center;
  align-self: center;
  font-size: 100px;
  color: var(--gray);
  padding-top: 27vh;
  padding-bottom: 3vh;

  transition: padding-top .6s ease-in-out;
}

.title-top {
  padding-top: 2vh;
}

.button {
  width: 130px;
  height: 40px;
  background-color: transparent;
  outline: var(--gray) solid;
  border-radius: 6px;
  border: none;
  margin-right: 2vw;
  font-size: 120%;
  font-weight: normal;

  box-shadow: inset 0 0 0 0 var(--gray);
  transition: box-shadow .25s ease-in-out, color .25s ease-in-out;
}

.button:hover {
  box-shadow: inset 0 -40px 0 0 var(--gray);
  color: #ffffff;
  cursor: pointer;
}

.buttons {
  display: grid;
  justify-content: center;
  align-content: center;
  align-self: center;
  height: auto;
}

.difficulty-panel {
  max-width: 30%;
  display: inline-block;
  padding-top: 2vh;
}

.difficulty-info {
  width: 85%;
  text-align: center;
  font-weight: normal;
  font-size: 16px;
  opacity: 20%;
  margin-top: 10px;
}

.github-logo {
  position: fixed;
  right: 0;
  bottom: 0;
  width: 6vh;
  height: 6vh;
  padding: 2.5vh;

  opacity: 45%;
  transition: opacity .3s;
}

.github-logo:hover {
  opacity: 80%;
}