* {
  font-family: 微软雅黑;
  box-sizing: border-box;
  position: relative;
}

input,
button,
textarea {
  border: 1px solid rgba(0, 0, 0, 0.1);
  /* border-radius: 3px; */
  padding: 5px 10px;
}

input {
  display: block;
  width: 100%;
  padding: 10px;
}

#task-input {
  background-color: #eee;
}

form.list-group-item {
  padding: 0;
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.incompleted {
  margin-bottom: 30px;
}

.incompleted > :first-child {
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

#main {
  width: 500px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 50px;
  margin-bottom: 50px;
}

.wrap {
  width: 500px;
  margin: 0 auto;
}

.navbar,
.header {
  text-align: center;
}

.navbar {
  background: #e7561d;
  color: #fff;
}

.navbar h1 {
  font-size: 25px;
  margin: 0;
  padding: 10px 0;
}

.header {
  padding: 20px 0;
  color: #555;
  font-size: 18px;
}

#alert-sound {
  display: none;
}

.tasklist .item button {
  display: none;
}

.tasklist .item:hover button {
  display: inline-block;
}