* {
  margin: 0;
  padding: 0;
}
.paint-box {
  width: 470px;
  margin: 100px auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: antiquewhite;
  padding: 15px;
  border: 1px solid gray;
  border-radius: 5px;
}

.tools {
  width: 450px;
  display: flex;
  align-items: center;
}
.tools-item {
  margin-right: 10px;
}

#cnvs {
  width: 450px;
  height: 450px;
  margin-top: 10px;
  margin-bottom: 10px;
  border-top: 1px solid gray;
  border-left: 1px solid gray;
  background-color: #fff;
  background-image: url("../images/background.png");
}
.btn-pause,
.btn-start,
.btn-reset {
  padding: 3px;
}

.box-up {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 450px;
}
.htp {
  width: 20px;
  height: 30px;
  position: relative;
  cursor: pointer;
}

.rules{
  display: none;
  width: 300px;
  background-color: white;
  border: 1px solid black;
  position: absolute;
  padding: 10px;
}
.rules-heading{
  text-align: center;
  margin-bottom: 5px;
}
.visible{
  display: block;
}