.header {
  position: fixed;
  width: 100%;
  height: 70px;
  top: 0;
  left: 0;
  background: lightblue;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
body {
  font-family: arial, helvetica, sans-serif;
  font-size: 14px;
  font-size-adjust: none;
  font-stretch: normal;
  font-style: normal;
  font-variant: normal;
  font-weight: normal;
}
body,
ul,
ol,
dl,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
p,
form,
fieldset,
legend,
input,
textarea,
select,
button,
th,
td {
  margin: 0;
  padding: 0;
}
ol,
ul {
  list-style: none;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}
th,
td {
  vertical-align: middle;
}
a {
  outline: none;
  color: #16418a;
  text-decoration: none;
  -webkit-backface-visibility: hidden;
}
a:focus {
  outline: none;
}
input:focus,
select:focus,
textarea:focus {
  outline: -webkit-focus-ring-color auto 0;
}