* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
/* --------------------
Bài 1
-------------------- */
#Ex01 .bg-img {
  width: 100%;
  height: 100%;
}

#Ex01 .container {
  position: relative;
}

#Ex01 h1 {
  padding: 10px;
}

#Ex01 .box {
  position: absolute;
  left: 58%;
  transform: translate(-50%, -245%);
  height: 250px;
  width: 470px;
  background-color: rgba(255, 255, 255, 0.6);
  border-radius: 4px;
  text-align: center;
  padding-top: 20px;
  line-height: 45px;
  font-size: 18px;
  font-weight: bold;
  font-family: system-ui;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}
/* --------------------
Bài 2
-------------------- */
#Ex02 .item {
  margin-bottom: 10px;
}

#Ex02 label {
  background-color: #d95924;
  margin-bottom: 10px;
  padding: 10px;
  color: white;
  font-family: system-ui;
  font-size: 14px;
  display: block;
}
#Ex02 .content {
  display: none;
}

#Ex02 input {
  display: none;
}

#Ex02 label::before {
  content: "+";
  padding: 8px;
  font-weight: bold;
  font-size: 18px;
}
#Ex02 .content {
  background-color: white;
  color: black;
  padding: 15px;
  border: 1px solid #ddd;
}
#Ex02 input:checked ~ .content {
  display: block;
  border: none;
}

#Ex02 input:checked + label::before {
  content: "–";
}
/* --------------------
Bài 3
-------------------- */

#Ex03 {
  font-family: system-ui;
}
#Ex03 .header {
  text-align: center;
  color: #383838;
  padding-bottom: 20px;
}

#Ex03 .menu {
  display: flex;
  gap: 30px;
  margin: 50px auto;
  justify-content: center;
}

#Ex03 .item {
  background: #fff;
  margin: 10px;
  padding: 30px 20px;
  flex: 1;
  text-align: center;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  max-width: 240px;
}

#Ex03 .icon {
  width: 100px;
  height: 100px;
  border: 2px solid #f1a83b;
  border-radius: 50px;
  justify-items: center;
  font-size: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 30px;
}

#Ex03 button {
  margin-top: 20px;
  padding: 10px;
  width: 100px;
  height: 40px;
  border: none;
  color: white;
  font-size: 0.7em;
  background-color: #f2a93b;
}

#Ex03 .item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}