bootstrap input focus color change code example

Example 1: how to highlight input on focus with box shadow

.form-section-input {
     transition: box-shadow 300ms ease-out;
}

.form-section-input:focus {
   box-shadow: 0px 0px 5px var(--light-blue-bg-color);
}

Example 2: blue glow input boostrap 4

textarea:focus,
input[type="text"]:focus,
input[type="password"]:focus,
input[type="datetime"]:focus,
input[type="datetime-local"]:focus,
input[type="date"]:focus,
input[type="month"]:focus,
input[type="time"]:focus,
input[type="week"]:focus,
input[type="number"]:focus,
input[type="email"]:focus,
input[type="url"]:focus,
input[type="search"]:focus,
input[type="tel"]:focus,
input[type="color"]:focus,
.uneditable-input:focus {   
  border-color: rgba(126, 239, 104, 0.8);
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset, 0 0 8px rgba(126, 239, 104, 0.6);
  outline: 0 none;
}