* {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

body {
  background-color: #3F72AF;
  margin: 0;
}

.container {
  width: 600px;
  height: 450px;
  background: #F9F7F7;
  -webkit-box-shadow: 0px 3px 8px rgba(0, 0, 0, 0.25);
          box-shadow: 0px 3px 8px rgba(0, 0, 0, 0.25);
  border-radius: 20px;
  margin: 56.26px auto;
  padding-top: 20px;
}
.container .title {
  text-align: center;
  font-size: 40px;
  line-height: 46px;
  margin-top: 20px;
  margin-bottom: 11px;
}
.container .form {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.container .form .write-text {
  width: 205px;
  outline: none;
  background: #DBE2EF;
  border: 1px solid rgba(177, 177, 177, 0.4);
  border-radius: 5px 0px 0px 5px;
  padding-left: 7px;
}
.container .form .btn {
  width: 45px;
  height: 32px;
  border-radius: 0px 5px 5px 0px;
  background: #3F72AF;
  border: 1px solid rgba(177, 177, 177, 0.4);
  color: #fff;
  font-size: 27px;
  -webkit-transition: 0.5s ease-in-out;
  transition: 0.5s ease-in-out;
}
.container .form .btn:disabled {
  background-color: #9dbfe7;
  cursor: not-allowed;
}
.container hr {
  width: 500px;
  margin-top: 16px;
}
.container .list {
  width: 500px;
  margin: 0 auto;
}
.container .list .item {
  background: #DBE2EF;
  height: 55px;
  border-radius: 5px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  font-size: 20px;
  margin-top: 15px;
  margin-bottom: 15px;
}
.container .list .item .checkbox {
  width: 20px;
  height: 20px;
  margin-left: 15px;
  margin-right: 10px;
}