A cover for electrical devices is disclosed. Particular implementations include an electrical device cover configured to mount over an electrical device includes a lid having a flexible membrane. The lid is coupled by a hinge to a base and the cover includes a cord port in an edge of a surface of the cover. The lid is configured to expand through the flexible membrane to an expanded position to accommodate an electrical connector coupled with the electrical device. The lid may also be configured to reduce in depth as the lid retracts from the expanded position to a retracted position through the flexible membrane.