Edit in JSFiddle

<h1>Услуги в сфере<br>семейного права</h1>
*, :before, :after {
  box-sizing: border-box;
}

body {
  margin: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #000;
  font-family: sans-serif;
  text-transform: uppercase;
}

h1 {
  font-size: 9vw;
  margin: 0;
  color: #fff;
}

@supports (background-clip: text) or (-webkit-background-clip: text) {

  h1 {
    background: linear-gradient(110deg, #303DD0 40%, #fff 40%, #fff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  
}