JSFiddle - React, Tailwind, and code Playground

HTML

<form action="#" method="php">
    
    <div class="input_block">
        <label>Имя: </label>
        <input type="text" name="login">
    </div>
    
    <div class="input_block">
        <label>Фамилия: </label>
        <input type="text" name="password">
    </div>
    
    <div class="input_block">
        <label>E-mail: </label>
        <input type="text" name="login">
    </div>
    
    <div class="input_block">
        <label>Телефон: </label>
        <input type="text" name="password">
    </div>
    
</form>

CSS

form {
    font-size: 0;
    line-height: 0;
    letter-spacing: -1px;
}

form .input_block {
	display: inline-block;
	vertical-align: top;
  //width: calc((100% - 60px)/2);
}

form .input_block:nth-child(2n) {
	margin: 0 0 20px 40px;
  width: calc((100% - 46px)/2);
}

form .input_block:nth-child(2n+1) {
  width: calc((100% - 74px)/2);
}

form .input_block:last-child {
	margin: 0 0 0 40px;
}

form label {
	display: inline-block;
	vertical-align: top;
	font-size: 14px;
	line-height: 20px;
	letter-spacing: normal;
}

form .input_block:nth-child(2n-1) label {
	width: 63px;
}

form .input_block:nth-child(2n) label {
	width: 77px;
}

form input {
  box-sizing: border-box;
	display: inline-block;
	vertical-align: top;
}

form .input_block:nth-child(2n-1) input {
    width: calc(100% - 63px);
}

form .input_block:nth-child(2n) input {
    width: calc(100% - 77px);
}