select.css

.custom-select-container,
.custom-select-value, 
.custom-select-options, 
.custom-select-option {
  box-sizing: border-box;
}

.custom-select-container {
    display: inline-block;
    position: relative;
}

.custom-select-value {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 200px;
    border: 1px solid black;
    padding: .25rem .5rem;
    cursor: pointer;
    user-select: none;
}

.custom-select-container:focus > .custom-select-value {
    border-width: 2px;
    outline: none;
}

.custom-select-value::after {
    content: '';
    display: inline-block;
    border: 5px solid transparent;
    border-top-color: black;
    margin-left: 12px;
    margin-top: 4px;
}

.custom-select-options {
    display: none; 
    position: absolute;
    padding: 0;
    margin: 0;
    border: 2px solid black;
    width: 100%;
    border-top: none;
    max-height:200px;
    overflow-y: auto;
}

.custom-select-options.show {
    display: block;
}


.custom-select-option {
    padding: .25rem .5rem;
    cursor: pointer;
}

.custom-select-option:hover {
    background-color: hsl(200, 100%, 70%);
}

.custom-select-option.selected {
    background-color: hsl(200, 100%, 50%);
}

#footer {
    position:absolute;
    bottom:0;
    width:100%;
    height:25px;   /* Height of the footer */
    background:greenyellow;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
 }