.course__header{z-index:100;position:fixed;top:0;left:0;width:100%;background:#fff;margin-left:300px;padding:20px 0;box-shadow:0 2px 12px rgba(0,0,0,.1)}@media (max-width:1000px){.course__header{bottom:0;margin-left:0;padding-left:25px;top:auto}}.course__header-content{display:flex;width:100%;max-width:1300px;margin:0 auto}.course__header-return{cursor:pointer;margin-left:15px}.course__header{width:calc(100% - 300px)}@media (max-width:1000px){.course__header{width:100%;padding:20px 25px}}@media (max-width:700px){.course__header{padding-left:12px;padding-right:12px}}.course__header-content{max-width:1000px}@media (max-width:1300px){.course__header-content{padding:0 24px}}@media (max-width:1000px){.course__header-content{padding:0}}.course__close-btn{display:flex;justify-content:flex-end;align-items:center;padding-right:0;margin-left:auto}