:root {
  --primary-background: linear-gradient(
    180deg,
    rgb(127, 37, 111),
    rgb(20, 38, 109)
  );
  --text-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  --btn-color: rgb(251, 226, 0);
}
body {
  margin: 0;
}
.container {
  width: 100vw;
  height: 100vh;
  position: fixed;
  margin: 0;
  background: var(--primary-background);
  display: inline-block;
}
.header-section {
  min-height: 9rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
}
.header-section .heading {
  font-size: 35px;
  font-family: var(--text-font);
  text-transform: uppercase;
  margin-top: 5px;
  color: burlywood;
  font-weight: 700;
}
.btn-start {
  background: var(--btn-color);
  font-size: 30px;
  padding: 5px 25px 5px 25px;
  border-radius: 5px;
  text-transform: uppercase;
  font-family: var(--text-font);
  cursor: pointer;
  border: 3px solid var(--btn-color);
  transition: ease-in-out 150ms;
}
.btn-start:hover {
  background: transparent;
  color: var(--btn-color);
}
.game-body {
  border: 5px solid black;
  width: 65vw;
  height: 70vh;
  display: block;
  background: whitesmoke;
  margin-top: 10px;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  overflow: hidden;
}
.game-body .mouse {
  width: 66px;
  height: 66px;
  position: absolute;
  transition: all 500ms cubic-bezier(0.165, 0.84, 0.44, 1);
  z-index: 1;
  cursor: pointer;
}
/* mouse movement css */

/* modal css */

.modal {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: -50%;
  height: 20rem;
  width: 33rem;
  background: rgb(249, 245, 245);
  border-radius: 5px;
  text-align: center;
  transition: all 150ms;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  font-family: var(--text-font);
}
.open-modal {
  position: absolute;
  top: 20%;
  animation: modal-down 1s cubic-bezier(0.165, 0.84, 0.44, 1);
}
.modal h1 {
  font-size: 75px;
}
.modal i {
  font-size: 35px;
  float: right;
  padding: 6px;
}

@keyframes modal-down {
  0% {
    top: -20%;
  }
  100% {
    top: 20%;
  }
}

.timer {
  position: absolute;
  display: block;
  left: 73%;
  top: 0;
  font-family: var(--text-font);
}
.timer h2 {
  text-transform: uppercase;
}
.timer span {
  font-size: 25px;
}

.difficulty-level {
  position: absolute;
  display: block;
  left: 10%;
  top: 0;
  font-family: var(--text-font);
}
.difficulty-level button {
  font-size: 20px;
  border-radius: 2px;
  border: 2px solid rgb(171, 171, 171);
  padding: 5px;
  cursor: pointer;
}

.difficulty-level button:focus {
  background: rgb(255, 32, 32);

  border: none;
}
.difficulty-level p {
  font-size: 20px;
  color: white;
  text-transform: uppercase;
}
/* close button */
.close-window {
  position: absolute;
  top: 0%;
  right: 2%;
}
.close-window i {
  font-size: 60px;
  color: black;
  padding: 10px;
  cursor: pointer;
  transition: all 150ms;
}
.close-window i:hover {
  transform: scale(1.2);
}

@media only screen and (max-width: 600px) {
  .difficulty-level {
    display: flex;
    flex-direction: column;
    top: 4%;
    left: 4%;
  }
  .difficulty-level button {
    font-size: 10px;
    width: 60%;
  }
  .difficulty-level p {
    font-size: 12px;
  }
  .header-section .heading {
    font-size: 20px;
  }
  .header-section {
    min-height: 11rem;
  }
  .btn-start {
    font-size: 15px;
  }
  .timer {
    font-size: 10px;
    top: 5%;
    left: 62%;
  }
  .timer span {
    font-size: 18px;
  }
  .close-window i {
    font-size: 20px;
  }
  .game-body {
    width: 88vw;
    margin-top: 17px;
    height: 65vh;
  }
  .game-body .mouse {
    width: 45px;
    height: 45px;
  }
  .modal {
    width: 80%;
    height: auto;
  }
  .modal i {
    font-size: 30px;
  }
  .modal h1 {
    font-size: 30px;
  }

  .modal p {
    font-size: 18px;
  }
}