CSS gradient border not showing correctly

I want to set half blue and orange for border-color of text input.

I tried using a gradient but it doesn't work.

what is my code problem?

.search {
  width: 550px;
  height: 50px;
  margin-left: 350px;
  border-radius: 20px;
  outline: none;
  margin-top: 70px;
  border: solid;
  border-image: linear-gradient(to right, rgb(254, 113, 53) 50%, rgb(55, 154, 214) 50%);
  font-size: 20px;
  text-align: center;
  transition: all 0.2s linear;
}

.search:hover,
.search:focus {
  border: #4cbea5 solid;
}

<div>
  <form method="post">
    <input type="Search" class="search" placeholder="Search">
  </form>
</div>

Solution

You need to specify the slice value inside border-image like this :

.search {
  width: 550px;
  height: 50px;
  border-radius: 20px;
  outline: none;
  margin-top: 70px;
  border: solid;
  border-image: linear-gradient(to right, rgb(254, 113, 53) 50%, rgb(55, 154, 214) 50%) 2;
  font-size: 20px;
  text-align: center;
 }

<form method="post">
    <input type="Search" class="search" placeholder="Search">
  </form>

You can read more about border-image

By the way, you cannot use border-radius with border-image but you can achive the same using multiple background and by adjusting background-clip. This will also allow you to have the hover behavior:

.search {
  width: 550px;
  height: 50px;
  border-radius: 20px;
  outline: none;
  margin-top: 70px;
  border: 2px solid transparent;
  background: 
    linear-gradient(#fff,#fff) content-box,
    linear-gradient(to right, rgb(254, 113, 53) 50%, rgb(55, 154, 214) 50%) border-box;
  font-size: 20px;
  text-align: center;
  transition: all 0.2s linear;
}

.search:hover,
.search:focus {
  border-color:#4cbea5;
}

<form method="post">
    <input type="Search" class="search" placeholder="Search">
  </form>